acos

math

Calculates the inverse cosine (arccosine) in radians

Syntax

acos(number)

number (number)

The number to calculate the arccosine of (must be between -1 and 1)

number

The arccosine in radians

Input:

0 | acos

Output:

1.571... (π/2)

Input:

acos(1)

Output:

Input:

acos(-1)

Output:

3.142... (π)

The acos() function calculates the inverse cosine (arccosine) of a number, returning the result in radians.

Use acos() to find angles from cosine values in trigonometric calculations. Input must be between -1 and 1.