Ohhh my gosh who ever keeps deleting or reporting my question or sum needs to stop now its annoying. Now again I'm bored down to talk abt anything idc. Now plz dont report me or sum again

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