Question

How do you do inverse cosine?

Answer 1

Finding inverse of a cosine

Cosine is a t-ratio define relation between side and angle in a right triangle

$$\begin{gathered} \cos \left(\theta \right)=\frac{adjacentside}{hypotenuse} \\ \Rightarrow \theta ={\cos }^{-1}\left(\frac{adjacentside}{hypotenuse}\right) \end{gathered}$$

Hence, we can find cosine by using the above formula.