Denesh is creating a triangular flower bed using three pieces of wood have sidebar lengths of 7 feet and 24 feet how long in feet should the third piece of wood be for denesh to create a right triangle

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