ACOS

Definition: ACOS is a function that returns the inverse cosine of a number. The inverse cosine of a number is the angle whose cosine is a given number.

Syntax: =ACOS(number)

Situation: This formula is suitable when you need to find the angle whose cosine is a given number.

Example: If the cosine of an angle is 0.5, the angle can be found using the formula =ACOS(0.5), which returns a value of 60 degrees.