Finding the Arctangent of Specified Number in Golang

• Last Updated : 01 Apr, 2020

Go language provides inbuilt support for basic constants and mathematical functions to perform operations on the numbers with the help of the math package. You are allowed to find the arctangent of the specified number with the help of Atan() function provided by the math package. So, you need to add a math package in your program with the help of the import keyword to access Atan() function.

Syntax:

func Atan(y float64) float64
• If you pass +Inf or -Inf in this function, then this function will return +Pi/2 or -Pi/2.
• If you pass 0 in this function, then this function will return 0.

Example 1:

 // Golang program to illustrate how// to find arctangent of the given number  package main  import (    "fmt"    "math")  // Main functionfunc main() {      // Finding arctangent of    // the given value    // Using Atan() function    res_1 := math.Atan(1)    res_2 := math.Atan(math.Inf(-3))    res_3 := math.Atan(0)    res_4 := math.Atan(math.NaN())      // Displaying the result    fmt.Printf("Result 1: %.1f", res_1)    fmt.Printf("\nResult 2: %.1f", res_2)    fmt.Printf("\nResult 3: %.1f", res_3)    fmt.Printf("\nResult 4: %.1f", res_4)}

Output:

Result 1: 0.8
Result 2: -1.6
Result 3: 0.0
Result 4: NaN

Example 2:

 // Golang program to illustrate how// to find arctangent of the given numberpackage main  import (    "fmt"    "math")  // Main functionfunc main() {      // Finding arctangent    // of the given value    nvalue_1 := math.Atan(1)    nvalue_2 := math.Atan(-3)      // Sum of the given values    res := nvalue_1 + nvalue_2      // Displaying results    fmt.Printf("%.1f + %.1f = %.1f",             nvalue_1, nvalue_2, res)  }

Output:

0.8 + -1.2 = -0.5

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