Question

Find the exact value of cos-1 the quantity square root of two divided by two . (2 points)

Answer 1

you'd want to check your Unit Circle, if you don't have one, this is a good time to get one, you can find many online.

$\bf \theta =cos^{-1}\left( \cfrac{\sqrt{2}}{2} \right)\implies \theta =\pm\cfrac{\pi }{4}$