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