# Finding Cosine Value 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 cosine of the specified radian argument with the help of Cos() 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 Cos() function.

Syntax:

`func Cos(y float64) float64`
• If you pass +Inf or -Inf in this function, then this function will return NaN(not-a-number).
• If you pass NaN in this function, then this function will return NaN.

Example 1:

 `// Golang program to illustrate how to find ` `// the cosine of the given radian argument ` ` `  `package main ` ` `  `import ( ` `    ``"fmt"` `    ``"math"` `) ` ` `  `// Main function ` `func main() { ` ` `  `    ``// Finding the cosine ` `    ``// of the given value ` `    ``// Using Cos() function ` `    ``res_1 := math.Cos(math.Pi / 4) ` `    ``res_2 := math.Cos(math.Inf(-3)) ` `    ``res_3 := math.Cos(0) ` `    ``res_4 := math.Cos(math.NaN()) ` `    ``res_5 := math.Cos(math.Pi) ` ` `  `    ``// 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) ` `    ``fmt.Printf(``"\nResult 5: %.1f"``, res_5) ` `} `

Output:

```Result 1: 0.7
Result 2: NaN
Result 3: 1.0
Result 4: NaN
Result 5: -1.0
```

Example 2:

 `// Golang program to illustrate how to find ` `// the cosine of the given radian argument ` ` `  `package main ` ` `  `import ( ` `    ``"fmt"` `    ``"math"` `) ` ` `  `// Main function ` `func main() { ` ` `  `    ``// Finding cosine of ` `    ``// the given number ` `    ``nvalue_1 := math.Cos(0) ` `    ``nvalue_2 := math.Cos(math.Pi / 2) ` ` `  `    ``// Sum of the given values ` `    ``res := nvalue_1 + nvalue_2 ` ` `  `    ``// Displaying results ` `    ``fmt.Printf(``"%.1f + %.1f = %.1f"``,  ` `            ``nvalue_1, nvalue_2, res) ` ` `  `} `

Output:

`1.0 + 0.0 = 1.0`

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