What is the measure of ZABC in the figure below? А
15
45°
B
15
с
A. 15°
Ο Ο
o o
B. 30°
C. 45°
ОО
D. 90°
E. 15°
F. Cannot be determined
O

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