Question

Find the exact value in the picture above

Answer 1

A and B

Explanation:

You can take a look at a unit circle to find the solution to this problem (see below).

`\cos^(-1)\left( (√(2))/(2) \right)= \\\\\\\pm (\pi)/(4)= \\\\\\(\pi)/(4), (7\pi)/(4)`

Hope this helps!