Question

o

Answer 1

theta is in quadrant 1 (not including 2theta)

Answer 2

There is a sneaky way of doing this, involving inverse cosine and inverse sine.

Answer 3

I got the answer 0.96

Answer 4

0.96 is correct :DDD

Answer 5

I always use inverse trig functions because double angles, half angles, etc are annoying.

Answer 6

Though, you should use them so you know