who wants to be put in a harry potter group chat? drop your snaps in the comments please, and then we can all talk about harry potter and share memes and tiktoks and videos and talk about our unhealthy obsessions :) DISCLAIMER: 14 years and older please :)

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