# package math - math - godocs.io

```
import "math"
```

Package math provides basic constants and mathematical functions.

This package does not guarantee bit-identical results across architectures.

## Constants

```
const (
	E   = 2.71828182845904523536028747135266249775724709369995957496696763 // https://oeis.org/A001113
	Pi  = 3.14159265358979323846264338327950288419716939937510582097494459 // https://oeis.org/A000796
	Phi = 1.61803398874989484820458683436563811772030917980576286213544862 // https://oeis.org/A001622

	Sqrt2   = 1.41421356237309504880168872420969807856967187537694807317667974 // https://oeis.org/A002193
	SqrtE   = 1.64872127070012814684865078781416357165377610071014801157507931 // https://oeis.org/A019774
	SqrtPi  = 1.77245385090551602729816748334114518279754945612238712821380779 // https://oeis.org/A002161
	SqrtPhi = 1.27201964951406896425242246173749149171560804184009624861664038 // https://oeis.org/A139339

	Ln2    = 0.693147180559945309417232121458176568075500134360255254120680009 // https://oeis.org/A002162
	Log2E  = 1 / Ln2
	Ln10   = 2.30258509299404568401799145468436420760110148862877297603332790 // https://oeis.org/A002392
	Log10E = 1 / Ln10
)
```
Mathematical constants.

```
const (
	MaxFloat32             = 0x1p127 * (1 + (1 - 0x1p-23)) // 3.40282346638528859811704183484516925440e+38
	SmallestNonzeroFloat32 = 0x1p-126 * 0x1p-23            // 1.401298464324817070923729583289916131280e-45

	MaxFloat64             = 0x1p1023 * (1 + (1 - 0x1p-52)) // 1.79769313486231570814527423731704356798070e+308
	SmallestNonzeroFloat64 = 0x1p-1022 * 0x1p-52            // 4.9406564584124654417656879286822137236505980e-324
)
```
Floating-point limit values. Max is the largest finite value representable by the type. SmallestNonzero is the smallest positive, non-zero value representable by the type.

```
const (
	MaxInt    = 1<<(intSize-1) - 1  // MaxInt32 or MaxInt64 depending on intSize.
	MinInt    = -1 << (intSize - 1) // MinInt32 or MinInt64 depending on intSize.
	MaxInt8   = 1<<7 - 1            // 127
	MinInt8   = -1 << 7             // -128
	MaxInt16  = 1<<15 - 1           // 32767
	MinInt16  = -1 << 15            // -32768
	MaxInt32  = 1<<31 - 1           // 2147483647
	MinInt32  = -1 << 31            // -2147483648
	MaxInt64  = 1<<63 - 1           // 9223372036854775807
	MinInt64  = -1 << 63            // -9223372036854775808
	MaxUint   = 1<<intSize - 1      // MaxUint32 or MaxUint64 depending on intSize.
	MaxUint8  = 1<<8 - 1            // 255
	MaxUint16 = 1<<16 - 1           // 65535
	MaxUint32 = 1<<32 - 1           // 4294967295
	MaxUint64 = 1<<64 - 1           // 18446744073709551615
)
```
Integer limit values.

## Functions

### func Abs
```
func Abs(x float64) float64
```
Abs returns the absolute value of x.

Special cases are:

```
Abs(±Inf) = +Inf
Abs(NaN) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	x := math.Abs(-2)
	fmt.Printf("%.1f\n", x)

	y := math.Abs(2)
	fmt.Printf("%.1f\n", y)
}

```

Output:
```
2.0
2.0
```

### func Acos
```
func Acos(x float64) float64
```
Acos returns the arccosine, in radians, of x.

Special case is:

```
Acos(x) = NaN if x < -1 or x > 1
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.2f", math.Acos(1))
}

```

Output:
```
0.00
```

### func Acosh
```
func Acosh(x float64) float64
```
Acosh returns the inverse hyperbolic cosine of x.

Special cases are:

```
Acosh(+Inf) = +Inf
Acosh(x) = NaN if x < 1
Acosh(NaN) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.2f", math.Acosh(1))
}

```

Output:
```
0.00
```

### func Asin
```
func Asin(x float64) float64
```
Asin returns the arcsine, in radians, of x.

Special cases are:

```
Asin(±0) = ±0
Asin(x) = NaN if x < -1 or x > 1
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.2f", math.Asin(0))
}

```

Output:
```
0.00
```

### func Asinh
```
func Asinh(x float64) float64
```
Asinh returns the inverse hyperbolic sine of x.

Special cases are:

```
Asinh(±0) = ±0
Asinh(±Inf) = ±Inf
Asinh(NaN) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.2f", math.Asinh(0))
}

```

Output:
```
0.00
```

### func Atan
```
func Atan(x float64) float64
```
Atan returns the arctangent, in radians, of x.

Special cases are:

```
Atan(±0) = ±0
Atan(±Inf) = ±Pi/2
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.2f", math.Atan(0))
}

```

Output:
```
0.00
```

### func Atan2
```
func Atan2(y, x float64) float64
```
Atan2 returns the arc tangent of y/x, using the signs of the two to determine the quadrant of the return value.

Special cases are (in order):

```
Atan2(y, NaN) = NaN
Atan2(NaN, x) = NaN
Atan2(+0, x>=0) = +0
Atan2(-0, x>=0) = -0
Atan2(+0, x<=-0) = +Pi
Atan2(-0, x<=-0) = -Pi
Atan2(y>0, 0) = +Pi/2
Atan2(y<0, 0) = -Pi/2
Atan2(+Inf, +Inf) = +Pi/4
Atan2(-Inf, +Inf) = -Pi/4
Atan2(+Inf, -Inf) = 3Pi/4
Atan2(-Inf, -Inf) = -3Pi/4
Atan2(y, +Inf) = 0
Atan2(y>0, -Inf) = +Pi
Atan2(y<0, -Inf) = -Pi
Atan2(+Inf, x) = +Pi/2
Atan2(-Inf, x) = -Pi/2
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.2f", math.Atan2(0, 0))
}

```

Output:
```
0.00
```

### func Atanh
```
func Atanh(x float64) float64
```
Atanh returns the inverse hyperbolic tangent of x.

Special cases are:

```
Atanh(1) = +Inf
Atanh(±0) = ±0
Atanh(-1) = -Inf
Atanh(x) = NaN if x < -1 or x > 1
Atanh(NaN) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.2f", math.Atanh(0))
}

```

Output:
```
0.00
```

### func Cbrt
```
func Cbrt(x float64) float64
```
Cbrt returns the cube root of x.

Special cases are:

```
Cbrt(±0) = ±0
Cbrt(±Inf) = ±Inf
Cbrt(NaN) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.2f\n", math.Cbrt(8))
	fmt.Printf("%.2f\n", math.Cbrt(27))
}

```

Output:
```
2.00
3.00
```

### func Ceil
```
func Ceil(x float64) float64
```
Ceil returns the least integer value greater than or equal to x.

Special cases are:

```
Ceil(±0) = ±0
Ceil(±Inf) = ±Inf
Ceil(NaN) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	c := math.Ceil(1.49)
	fmt.Printf("%.1f", c)
}

```

Output:
```
2.0
```

### func Copysign
```
func Copysign(f, sign float64) float64
```
Copysign returns a value with the magnitude of f and the sign of sign.

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.2f", math.Copysign(3.2, -1))
}

```

Output:
```
-3.20
```

### func Cos
```
func Cos(x float64) float64
```
Cos returns the cosine of the radian argument x.

Special cases are:

```
Cos(±Inf) = NaN
Cos(NaN) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.2f", math.Cos(math.Pi/2))
}

```

Output:
```
0.00
```

### func Cosh
```
func Cosh(x float64) float64
```
Cosh returns the hyperbolic cosine of x.

Special cases are:

```
Cosh(±0) = 1
Cosh(±Inf) = +Inf
Cosh(NaN) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.2f", math.Cosh(0))
}

```

Output:
```
1.00
```

### func Dim
```
func Dim(x, y float64) float64
```
Dim returns the maximum of x-y or 0.

Special cases are:

```
Dim(+Inf, +Inf) = NaN
Dim(-Inf, -Inf) = NaN
Dim(x, NaN) = Dim(NaN, x) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.2f\n", math.Dim(4, -2))
	fmt.Printf("%.2f\n", math.Dim(-4, 2))
}

```

Output:
```
6.00
0.00
```

### func Erf
```
func Erf(x float64) float64
```
Erf returns the error function of x.

Special cases are:

```
Erf(+Inf) = 1
Erf(-Inf) = -1
Erf(NaN) = NaN
```

### func Erfc
```
func Erfc(x float64) float64
```
Erfc returns the complementary error function of x.

Special cases are:

```
Erfc(+Inf) = 0
Erfc(-Inf) = 2
Erfc(NaN) = NaN
```

### func Erfcinv
```
func Erfcinv(x float64) float64
```
Erfcinv returns the inverse of Erfc(x).

Special cases are:

```
Erfcinv(0) = +Inf
Erfcinv(2) = -Inf
Erfcinv(x) = NaN if x < 0 or x > 2
Erfcinv(NaN) = NaN
```

### func Erfinv
```
func Erfinv(x float64) float64
```
Erfinv returns the inverse error function of x.

Special cases are:

```
Erfinv(1) = +Inf
Erfinv(-1) = -Inf
Erfinv(x) = NaN if x < -1 or x > 1
Erfinv(NaN) = NaN
```

### func Exp
```
func Exp(x float64) float64
```
Exp returns e**x, the base-e exponential of x.

Special cases are:

```
Exp(+Inf) = +Inf
Exp(NaN) = NaN
```

Very large values overflow to 0 or +Inf. Very small values underflow to 1.

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.2f\n", math.Exp(1))
	fmt.Printf("%.2f\n", math.Exp(2))
	fmt.Printf("%.2f\n", math.Exp(-1))
}

```

Output:
```
2.72
7.39
0.37
```

### func Exp2
```
func Exp2(x float64) float64
```
Exp2 returns 2**x, the base-2 exponential of x.

Special cases are the same as Exp.

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.2f\n", math.Exp2(1))
	fmt.Printf("%.2f\n", math.Exp2(-3))
}

```

Output:
```
2.00
0.12
```

### func Expm1
```
func Expm1(x float64) float64
```
Expm1 returns e**x - 1, the base-e exponential of x minus 1. It is more accurate than Exp(x) - 1 when x is near zero.

Special cases are:

```
Expm1(+Inf) = +Inf
Expm1(-Inf) = -1
Expm1(NaN) = NaN
```

Very large values overflow to -1 or +Inf.

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.6f\n", math.Expm1(0.01))
	fmt.Printf("%.6f\n", math.Expm1(-1))
}

```

Output:
```
0.010050
-0.632121
```

### func FMA
```
func FMA(x, y, z float64) float64
```
FMA returns x * y + z, computed with only one rounding. (That is, FMA returns the fused multiply-add of x, y, and z.)

### func Float32bits
```
func Float32bits(f float32) uint32
```
Float32bits returns the IEEE 754 binary representation of f, with the sign bit of f and the result in the same bit position. Float32bits(Float32frombits(x)) == x.

### func Float32frombits
```
func Float32frombits(b uint32) float32
```
Float32frombits returns the floating-point number corresponding to the IEEE 754 binary representation b, with the sign bit of b and the result in the same bit position. Float32frombits(Float32bits(x)) == x.

### func Float64bits
```
func Float64bits(f float64) uint64
```
Float64bits returns the IEEE 754 binary representation of f, with the sign bit of f and the result in the same bit position, and Float64bits(Float64frombits(x)) == x.

### func Float64frombits
```
func Float64frombits(b uint64) float64
```
Float64frombits returns the floating-point number corresponding to the IEEE 754 binary representation b, with the sign bit of b and the result in the same bit position. Float64frombits(Float64bits(x)) == x.

### func Floor
```
func Floor(x float64) float64
```
Floor returns the greatest integer value less than or equal to x.

Special cases are:

```
Floor(±0) = ±0
Floor(±Inf) = ±Inf
Floor(NaN) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	c := math.Floor(1.51)
	fmt.Printf("%.1f", c)
}

```

Output:
```
1.0
```

### func Frexp
```
func Frexp(f float64) (frac float64, exp int)
```
Frexp breaks f into a normalized fraction and an integral power of two. It returns frac and exp satisfying f == frac × 2**exp, with the absolute value of frac in the interval [½, 1).

Special cases are:

```
Frexp(±0) = ±0, 0
Frexp(±Inf) = ±Inf, 0
Frexp(NaN) = NaN, 0
```

### func Gamma
```
func Gamma(x float64) float64
```
Gamma returns the Gamma function of x.

Special cases are:

```
Gamma(+Inf) = +Inf
Gamma(+0) = +Inf
Gamma(-0) = -Inf
Gamma(x) = NaN for integer x < 0
Gamma(-Inf) = NaN
Gamma(NaN) = NaN
```

### func Hypot
```
func Hypot(p, q float64) float64
```
Hypot returns Sqrt(p*p + q*q), taking care to avoid unnecessary overflow and underflow.

Special cases are:

```
Hypot(±Inf, q) = +Inf
Hypot(p, ±Inf) = +Inf
Hypot(NaN, q) = NaN
Hypot(p, NaN) = NaN
```

### func Ilogb
```
func Ilogb(x float64) int
```
Ilogb returns the binary exponent of x as an integer.

Special cases are:

```
Ilogb(±Inf) = MaxInt32
Ilogb(0) = MinInt32
Ilogb(NaN) = MaxInt32
```

### func Inf
```
func Inf(sign int) float64
```
Inf returns positive infinity if sign >= 0, negative infinity if sign < 0.

### func IsInf
```
func IsInf(f float64, sign int) bool
```
IsInf reports whether f is an infinity, according to sign. If sign > 0, IsInf reports whether f is positive infinity. If sign < 0, IsInf reports whether f is negative infinity. If sign == 0, IsInf reports whether f is either infinity.

### func IsNaN
```
func IsNaN(f float64) (is bool)
```
IsNaN reports whether f is an IEEE 754 “not-a-number” value.

### func J0
```
func J0(x float64) float64
```
J0 returns the order-zero Bessel function of the first kind.

Special cases are:

```
J0(±Inf) = 0
J0(0) = 1
J0(NaN) = NaN
```

### func J1
```
func J1(x float64) float64
```
J1 returns the order-one Bessel function of the first kind.

Special cases are:

```
J1(±Inf) = 0
J1(NaN) = NaN
```

### func Jn
```
func Jn(n int, x float64) float64
```
Jn returns the order-n Bessel function of the first kind.

Special cases are:

```
Jn(n, ±Inf) = 0
Jn(n, NaN) = NaN
```

### func Ldexp
```
func Ldexp(frac float64, exp int) float64
```
Ldexp is the inverse of Frexp. It returns frac × 2**exp.

Special cases are:

```
Ldexp(±0, exp) = ±0
Ldexp(±Inf, exp) = ±Inf
Ldexp(NaN, exp) = NaN
```

### func Lgamma
```
func Lgamma(x float64) (lgamma float64, sign int)
```
Lgamma returns the natural logarithm and sign (-1 or +1) of Gamma(x).

Special cases are:

```
Lgamma(+Inf) = +Inf
Lgamma(0) = +Inf
Lgamma(-integer) = +Inf
Lgamma(-Inf) = -Inf
Lgamma(NaN) = NaN
```

### func Log
```
func Log(x float64) float64
```
Log returns the natural logarithm of x.

Special cases are:

```
Log(+Inf) = +Inf
Log(0) = -Inf
Log(x < 0) = NaN
Log(NaN) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	x := math.Log(1)
	fmt.Printf("%.1f\n", x)

	y := math.Log(2.7183)
	fmt.Printf("%.1f\n", y)
}

```

Output:
```
0.0
1.0
```

### func Log10
```
func Log10(x float64) float64
```
Log10 returns the decimal logarithm of x. The special cases are the same as for Log.

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.1f", math.Log10(100))
}

```

Output:
```
2.0
```

### func Log1p
```
func Log1p(x float64) float64
```
Log1p returns the natural logarithm of 1 plus its argument x. It is more accurate than Log(1 + x) when x is near zero.

Special cases are:

```
Log1p(+Inf) = +Inf
Log1p(±0) = ±0
Log1p(-1) = -Inf
Log1p(x < -1) = NaN
Log1p(NaN) = NaN
```

### func Log2
```
func Log2(x float64) float64
```
Log2 returns the binary logarithm of x. The special cases are the same as for Log.

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.1f", math.Log2(256))
}

```

Output:
```
8.0
```

### func Logb
```
func Logb(x float64) float64
```
Logb returns the binary exponent of x.

Special cases are:

```
Logb(±Inf) = +Inf
Logb(0) = -Inf
Logb(NaN) = NaN
```

### func Max
```
func Max(x, y float64) float64
```
Max returns the larger of x or y.

Special cases are:

```
Max(x, +Inf) = Max(+Inf, x) = +Inf
Max(x, NaN) = Max(NaN, x) = NaN
Max(+0, ±0) = Max(±0, +0) = +0
Max(-0, -0) = -0
```

Note that this differs from the built-in function max when called with NaN and +Inf.

### func Min
```
func Min(x, y float64) float64
```
Min returns the smaller of x or y.

Special cases are:

```
Min(x, -Inf) = Min(-Inf, x) = -Inf
Min(x, NaN) = Min(NaN, x) = NaN
Min(-0, ±0) = Min(±0, -0) = -0
```

Note that this differs from the built-in function min when called with NaN and -Inf.

### func Mod
```
func Mod(x, y float64) float64
```
Mod returns the floating-point remainder of x/y. The magnitude of the result is less than y and its sign agrees with that of x.

Special cases are:

```
Mod(±Inf, y) = NaN
Mod(NaN, y) = NaN
Mod(x, 0) = NaN
Mod(x, ±Inf) = x
Mod(x, NaN) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	c := math.Mod(7, 4)
	fmt.Printf("%.1f", c)
}

```

Output:
```
3.0
```

### func Modf
```
func Modf(f float64) (int float64, frac float64)
```
Modf returns integer and fractional floating-point numbers that sum to f. Both values have the same sign as f.

Special cases are:

```
Modf(±Inf) = ±Inf, NaN
Modf(NaN) = NaN, NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	int, frac := math.Modf(3.14)
	fmt.Printf("%.2f, %.2f\n", int, frac)

	int, frac = math.Modf(-2.71)
	fmt.Printf("%.2f, %.2f\n", int, frac)
}

```

Output:
```
3.00, 0.14
-2.00, -0.71
```

### func NaN
```
func NaN() float64
```
NaN returns an IEEE 754 “not-a-number” value.

### func Nextafter
```
func Nextafter(x, y float64) (r float64)
```
Nextafter returns the next representable float64 value after x towards y.

Special cases are:

```
Nextafter(x, x)   = x
Nextafter(NaN, y) = NaN
Nextafter(x, NaN) = NaN
```

### func Nextafter32
```
func Nextafter32(x, y float32) (r float32)
```
Nextafter32 returns the next representable float32 value after x towards y.

Special cases are:

```
Nextafter32(x, x)   = x
Nextafter32(NaN, y) = NaN
Nextafter32(x, NaN) = NaN
```

### func Pow
```
func Pow(x, y float64) float64
```
Pow returns x**y, the base-x exponential of y.

Special cases are (in order):

```
Pow(x, ±0) = 1 for any x
Pow(1, y) = 1 for any y
Pow(x, 1) = x for any x
Pow(NaN, y) = NaN
Pow(x, NaN) = NaN
Pow(±0, y) = ±Inf for y an odd integer < 0
Pow(±0, -Inf) = +Inf
Pow(±0, +Inf) = +0
Pow(±0, y) = +Inf for finite y < 0 and not an odd integer
Pow(±0, y) = ±0 for y an odd integer > 0
Pow(±0, y) = +0 for finite y > 0 and not an odd integer
Pow(-1, ±Inf) = 1
Pow(x, +Inf) = +Inf for |x| > 1
Pow(x, -Inf) = +0 for |x| > 1
Pow(x, +Inf) = +0 for |x| < 1
Pow(x, -Inf) = +Inf for |x| < 1
Pow(+Inf, y) = +Inf for y > 0
Pow(+Inf, y) = +0 for y < 0
Pow(-Inf, y) = Pow(-0, -y)
Pow(x, y) = NaN for finite x < 0 and finite non-integer y
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	c := math.Pow(2, 3)
	fmt.Printf("%.1f", c)
}

```

Output:
```
8.0
```

### func Pow10
```
func Pow10(n int) float64
```
Pow10 returns 10**n, the base-10 exponential of n.

Special cases are:

```
Pow10(n) =    0 for n < -323
Pow10(n) = +Inf for n > 308
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	c := math.Pow10(2)
	fmt.Printf("%.1f", c)
}

```

Output:
```
100.0
```

### func Remainder
```
func Remainder(x, y float64) float64
```
Remainder returns the IEEE 754 floating-point remainder of x/y.

Special cases are:

```
Remainder(±Inf, y) = NaN
Remainder(NaN, y) = NaN
Remainder(x, 0) = NaN
Remainder(x, ±Inf) = x
Remainder(x, NaN) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.1f", math.Remainder(100, 30))
}

```

Output:
```
10.0
```

### func Round
```
func Round(x float64) float64
```
Round returns the nearest integer, rounding half away from zero.

Special cases are:

```
Round(±0) = ±0
Round(±Inf) = ±Inf
Round(NaN) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	p := math.Round(10.5)
	fmt.Printf("%.1f\n", p)

	n := math.Round(-10.5)
	fmt.Printf("%.1f\n", n)
}

```

Output:
```
11.0
-11.0
```

### func RoundToEven
```
func RoundToEven(x float64) float64
```
RoundToEven returns the nearest integer, rounding ties to even.

Special cases are:

```
RoundToEven(±0) = ±0
RoundToEven(±Inf) = ±Inf
RoundToEven(NaN) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	u := math.RoundToEven(11.5)
	fmt.Printf("%.1f\n", u)

	d := math.RoundToEven(12.5)
	fmt.Printf("%.1f\n", d)
}

```

Output:
```
12.0
12.0
```

### func Signbit
```
func Signbit(x float64) bool
```
Signbit reports whether x is negative or negative zero.

### func Sin
```
func Sin(x float64) float64
```
Sin returns the sine of the radian argument x.

Special cases are:

```
Sin(±0) = ±0
Sin(±Inf) = NaN
Sin(NaN) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.2f", math.Sin(math.Pi))
}

```

Output:
```
0.00
```

### func Sincos
```
func Sincos(x float64) (sin, cos float64)
```
Sincos returns Sin(x), Cos(x).

Special cases are:

```
Sincos(±0) = ±0, 1
Sincos(±Inf) = NaN, NaN
Sincos(NaN) = NaN, NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	sin, cos := math.Sincos(0)
	fmt.Printf("%.2f, %.2f", sin, cos)
}

```

Output:
```
0.00, 1.00
```

### func Sinh
```
func Sinh(x float64) float64
```
Sinh returns the hyperbolic sine of x.

Special cases are:

```
Sinh(±0) = ±0
Sinh(±Inf) = ±Inf
Sinh(NaN) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.2f", math.Sinh(0))
}

```

Output:
```
0.00
```

### func Sqrt
```
func Sqrt(x float64) float64
```
Sqrt returns the square root of x.

Special cases are:

```
Sqrt(+Inf) = +Inf
Sqrt(±0) = ±0
Sqrt(x < 0) = NaN
Sqrt(NaN) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	const (
		a = 3
		b = 4
	)
	c := math.Sqrt(a*a + b*b)
	fmt.Printf("%.1f", c)
}

```

Output:
```
5.0
```

### func Tan
```
func Tan(x float64) float64
```
Tan returns the tangent of the radian argument x.

Special cases are:

```
Tan(±0) = ±0
Tan(±Inf) = NaN
Tan(NaN) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.2f", math.Tan(0))
}

```

Output:
```
0.00
```

### func Tanh
```
func Tanh(x float64) float64
```
Tanh returns the hyperbolic tangent of x.

Special cases are:

```
Tanh(±0) = ±0
Tanh(±Inf) = ±1
Tanh(NaN) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.2f", math.Tanh(0))
}

```

Output:
```
0.00
```

### func Trunc
```
func Trunc(x float64) float64
```
Trunc returns the integer value of x.

Special cases are:

```
Trunc(±0) = ±0
Trunc(±Inf) = ±Inf
Trunc(NaN) = NaN
```

### Example

Code:
```
package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Printf("%.2f\n", math.Trunc(math.Pi))
	fmt.Printf("%.2f\n", math.Trunc(-1.2345))
}

```

Output:
```
3.00
-1.00
```

### func Y0
```
func Y0(x float64) float64
```
Y0 returns the order-zero Bessel function of the second kind.

Special cases are:

```
Y0(+Inf) = 0
Y0(0) = -Inf
Y0(x < 0) = NaN
Y0(NaN) = NaN
```

### func Y1
```
func Y1(x float64) float64
```
Y1 returns the order-one Bessel function of the second kind.

Special cases are:

```
Y1(+Inf) = 0
Y1(0) = -Inf
Y1(x < 0) = NaN
Y1(NaN) = NaN
```

### func Yn
```
func Yn(n int, x float64) float64
```
Yn returns the order-n Bessel function of the second kind.

Special cases are:

```
Yn(n, +Inf) = 0
Yn(n ≥ 0, 0) = -Inf
Yn(n < 0, 0) = +Inf if n is odd, -Inf if n is even
Yn(n, x < 0) = NaN
Yn(n, NaN) = NaN
```


## Directories

=> /math/big math/big
Package big implements arbitrary-precision arithmetic (big numbers).
=> /math/bits math/bits
Package bits implements bit counting and manipulation functions for the predeclared unsigned integer types.
=> /math/cmplx math/cmplx
Package cmplx provides basic constants and mathematical functions for complex numbers.
=> /math/rand math/rand
Package rand implements pseudo-random number generators suitable for tasks such as simulation, but it should not be used for security-sensitive work.
=> /math/rand/v2 math/rand/v2
Package rand implements pseudo-random number generators suitable for tasks such as simulation, but it should not be used for security-sensitive work.

## Details
=> ?view=versions Version: v1.22.5 (latest)
* Published: Jun 27, 2024
=> ?view=platforms Platform: linux/amd64
=> ?view=imports Imports: 3 packages
* Last checked: 10 seconds ago
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