Acontractor wants to replace the baseboard of a room whose length is 15 feet and width is 6 feet. how much will the baseboard cost if the material they will use is $5 per foot ?

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