Answer:
The answer is 2
Explanation:
This means that
This will be a long one to solve
-> apply cos identity to right side
-> simplify according to unit circle
->apply cos identity again
If you apply for unit circle numbers,
you will get 2
I do not recommend using a calculator for these questions, but instead, turn the form into
other base unit circle locations, and most likely this is the method that your teacher counts as "right."
when using a calculator, it tends to "round" the number, which result in a inaccurate answer