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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 function
func 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 number
package main
  
import (
    "fmt"
    "math"
)
  
// Main function
func 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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