Cos()

The Cos() function returns the cosine of the given angle (in radians). The math library must be imported in order to use this function.

Syntax

result := math.Cos(angle)

Where result is the cosine value of angle, returned as a float, except under the following circumstances:

• The result of Cos(-Inf) is NaN
• The result of Cos(+Inf) is NaN
• The result of Cos(NaN) is NaN

Example

The following calculates the cosine of angle and prints out the result:

package main

import (
  "fmt"
  "math"
)

func main() {
  angle := math.Pi / 6
  cosine := math.Cos(angle)
  fmt.Printf("%.1f\n", cosine)
}

The output will be:

0.9

Codebyte Example

The following example is runnable and shows how the Cos() function handles infinite values.

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