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Inverse Cosine

Inverse Cosine

Author: Graham Pardun

This lesson will introduce the inverse cosine ratio, and demonstrate how to apply it to solve for an unknown angle of a right triangle.

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The Inverse Cosine Function (Also Known As Arccosine)

Arccosine is the inverse of cosine -- so I'll review what "cosine" means in the first place, and what an inverse function is in general. Then we'll go through the process of using the arccosine function to determine unknown angles, and all will become clear!