Trigonometric functions: Difference between revisions

=={{header|Go}}==

The Go math package provides the constant pi and the six trigonometric functions called for by the task. The functions all use the float64 type and work in radians. It also provides a Sincos function.

<lang go>package main

import (

"fmt"

"math"

)

const d = 30.

const r = d * math.Pi / 180

var s = .5

var c = math.Sqrt(3) / 2

var t = 1 / math.Sqrt(3)

func main() {

fmt.Printf("sin(%9.6f deg) = %f\n", d, math.Sin(d*math.Pi/180))

fmt.Printf("sin(%9.6f rad) = %f\n", r, math.Sin(r))

fmt.Printf("cos(%9.6f deg) = %f\n", d, math.Cos(d*math.Pi/180))

fmt.Printf("cos(%9.6f rad) = %f\n", r, math.Cos(r))

fmt.Printf("tan(%9.6f deg) = %f\n", d, math.Tan(d*math.Pi/180))

fmt.Printf("tan(%9.6f rad) = %f\n", r, math.Tan(r))

fmt.Printf("asin(%f) = %9.6f deg\n", s, math.Asin(s)*180/math.Pi)

fmt.Printf("asin(%f) = %9.6f rad\n", s, math.Asin(s))

fmt.Printf("acos(%f) = %9.6f deg\n", c, math.Acos(c)*180/math.Pi)

fmt.Printf("acos(%f) = %9.6f rad\n", c, math.Acos(c))

fmt.Printf("atan(%f) = %9.6f deg\n", t, math.Atan(t)*180/math.Pi)

fmt.Printf("atan(%f) = %9.6f rad\n", t, math.Atan(t))

}</lang>

Output:

<pre>

sin(30.000000 deg) = 0.500000

sin( 0.523599 rad) = 0.500000

cos(30.000000 deg) = 0.866025

cos( 0.523599 rad) = 0.866025

tan(30.000000 deg) = 0.577350

tan( 0.523599 rad) = 0.577350

asin(0.500000) = 30.000000 deg

asin(0.500000) = 0.523599 rad

acos(0.866025) = 30.000000 deg

acos(0.866025) = 0.523599 rad

atan(0.577350) = 30.000000 deg

atan(0.577350) = 0.523599 rad

</pre>