Which polynomial represents the sum below? (3x^2+3) + (3x^2+x+4) a) 6x^2+x+12 b) 9x^2+x+7 c) 6x^@+x+7 d)9x^2+x+12

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