Avani is building a rectangular play area the length of the play area is 7.5 meter the width of the play area is 5.3 meters if she wants to cover the area in foam how much foam does she need to buy?

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