Question

What is the cosine inverse of $0$?

Answer 1

Cosine inverse is the inverse function of the cosine function. It is denoted by ${\cos }^{-1}$ or $\arccos$.

The cosine inverse of $0$ is,

${\cos }^{-1}\left(0\right)=90°$ $\left[\because \cos \left(90°\right)=0\right]$

Hence, the cosine inverse of $0$ is $90°$.