How do you use the sum and difference formulas to evaluate angles not on the unit circle? How do you use the sum and difference formulas verify identities?

Explanation is in the file

cutt.ly/nz6VGda

the answer is (-8,-5)

step-by-step explanation:

the endpoint to midpoint is half the length. the length is (-2,-1) so when you are at the midpoint just add it to it to find your answer -6+(-2)= -8 and -4+(-1)=-5 so (-8,-5)