What is math.acos() in Python?

The acos() functionalso called the arc cosine function in Python returns the inverse cosine of a number. To be more specific, it returns the inverse cosine of a number in the radians.

Figure 1 shows the mathematical representation of the acos() function, and Figure 2 shows the visual representation of the acos() function.

Note: The math module is required for this function.

To convert radians to degrees, use the following formula:

degrees = radians * ( 180.0 / pi )

Syntax

acos(num)

Parameter

This function requires a number as a parameter. The parameter must be a double value between -1 and 1.

• -1 <= parameter <= 1

Return value

acos() returns the inverse cosine of a number (radians) that is sent as a parameter. The return value lies in interval [0, pi] radians.

Example