Three vertices of parallelogram MNPQ are M(-1,1) , N(2,3) , and P(4,1). Plot points M, N, P, Q in the coordinate plane below.

(TEST)

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b