Asap! if ∠a ≅ ∠d and ∠c ≅ ∠f, which additional statement does not allow you to conclude that δabc ≅ δdef ?
a) bc ≅ ef
b) ∠b ≅ ∠e
d) ac ≅ df

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