Here, We will learnÂ **how to get cosine of the radian number in go.Â **We can get it by usingÂ **Cos() function in math package in go golang.**

**Function prototype:**

`func Cos(no float64) float64`

**Return value:**

`Cos() function in math package returns`

the cosine of the radian number.

**Example with code:**

```
package main
import (
"fmt"
"math"
)
func main() {
no := math.Cos(1)
fmt.Printf("%.2f\n", no)
no = math.Cos(0.25)
fmt.Printf("%.2f\n", no)
no = math.Cos(0.75)
fmt.Printf("%.2f\n", no)
no = math.Cos(math.Pi/2)
fmt.Printf("%.2f\n", no)
}
```

**Output:**

`0.54`

0.97

0.73

0.00

**To learn more about golang, Please refer given below link:**

https://www.techieindoor.com/go-lang-tutorial/

**References:**

https://golang.org/doc/

https://golang.org/pkg/