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{√(2)}{2} \right)\implies \theta =\pm\cfrac{\pi }{4}`