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The expression cos(A-B) - cos(A+B) is equal to 1) -2sinAsinB 2) -2cosB 3) 2cosAcosB 4) 2sinAsinB So far, all I've gotten is cosxcosy + sinxsiny - cosxcosy - sinxsiny I don't know where to go from there.

asked Apr 8, 2017

Mathematics
college

2 answers

5 votes

65.6k views

Original price is 45.00 and the markup is 57%

asked Jan 16, 2017

Mathematics
high-school

2 answers

1 vote

60.0k views

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