Solve: 2 and 2 are the lengths of the legs of a right
triangle. What is the length of the hypotenuse?
A. 2
B. 2012
C. All of these choices
D. 4

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