# Finding the Arccosine of Specified Number in Golang

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 arccosine of the specified number with the help of Acos() 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 the Acos() function.

Syntax:

`func Acos(y float64) float64`

If the value of y < -1 or y > 1, then Acos(y) = NaN

Example 1:

 `// Golang program to illustrate how to ` `// find arccosine of the given number ` ` `  `package main ` ` `  `import ( ` `    ``"fmt"` `    ``"math"` `) ` ` `  `// Main function ` `func main() { ` ` `  `    ``// Finding arccosine of ` `    ``// the given value ` `    ``// Using Acos() function ` `    ``res_1 := math.Acos(1) ` `    ``res_2 := math.Acos(-1) ` `    ``res_3 := math.Acos(3.3) ` ` `  `    ``// Displaying the result ` `    ``fmt.Printf(``"Result 1: %.1f"``, res_1) ` `    ``fmt.Printf(``"\nResult 2: %.1f"``, res_2) ` `    ``fmt.Printf(``"\nResult 3: %.1f"``, res_3) ` `} `

Output:

```Result 1: 0.0
Result 2: 3.1
Result 3: NaN
```

Example 2:

 `// Golang program to illustrate how to ` `// find arccosine of the given number ` ` `  `package main ` ` `  `import ( ` `    ``"fmt"` `    ``"math"` `) ` ` `  `// Main function ` `func main() { ` ` `  `    ``// Finding arccosine ` `    ``// of the given value ` `    ``nvalue_1 := math.Acos(1) ` `    ``nvalue_2 := math.Acos(-1) ` ` `  `    ``// Sum of the given values ` `    ``res := nvalue_1 + nvalue_2 ` ` `  `    ``// Displaying results ` `    ``fmt.Printf(``"%.1f + %.1f = %.1f"``, ` `            ``nvalue_1, nvalue_2, res) ` ` `  `} `

Output:

`0.0 + 3.1 = 3.1`

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