Triangle ABC is dilated with a scale factor of 3. The corresponding sides of the image will be: A. Congruent B. 3 times as big. C. 9 times as big D. not

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