Brian is visiting Britain and wants to exchange U. S. dollars for British pounds. The rate of exchange is 1 U. S. dollar =0.65 British pound. How many British pounds will Brian get for 200
U. S. dollars?

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