Melissa needs to mix 2 cups of baking soda with 3 cups of vinegar to make a cleaning solution. how many cups of baking soda are needed for each cup of vinegar?

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