In the form of a paragraph, use complete sentences to describe some of your observations that helped you to conclude who researched textbook prices. Use specific examples from the data, histograms, and box and whisker plots.

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