Can the following 2 questions be answered correctly as example for me to use because I previously got it incorrect I will check it please double check and can it also be written neatly. Thank you!

Question 17 Go/1 pt 92 2 4 0 Details Use an addition or subtraction formula to find the exact value of sin Question Help: @ Video 1 0 Video 2 Calculator Submit Question O Question 18 0/1 pt 92 2 4 0 Details Use an addition or subtraction formula to write the expression as a trigonometric function of one angle: COS -COS + sin sin r- The exact value of this function is Question He A Worked Example 1