# Arccos Calculator

The arccos calculator helps you calculate the inverse cosine function arccos in degrees and radians.

Enter the x value between -1 and 1 to calculate the arccos.

Inverse cosine, or arccosine, is the inverse of the cosine function. It measures the unknown angle when the lengths of two sides of a right triangle are known. It is also abbreviated as 'arccos'.

arccos x = cos-1x

You might want to find the foci or calculate the cosecant.

**References**

- https://study.com/academy/lesson/arccosine-definition-lesson-quiz.html. (n.d.). https://study.com/academy/lesson/arccosine-definition-lesson-quiz.html
- What is the difference between y = arccos x and y = cos-1 x? - GeeksforGeeks. (2022, April 22). GeeksforGeeks. https://www.geeksforgeeks.org/what-is-the-difference-between-y-arccos-x-and-y-cos-1-x/