Question

cos(a-b)-cos(a+b) =​

Answer 1

cos(a-b)-cos(a+b)= -2sin(a)*sin(-b)= -sin(a)*(-sin(b))= 2sin(a)*sin(b)

Answer 2

Ответ:

2sin(a)sin(b)

Пошаговое объяснение:

cos(a-b)-cos(a+b)= -2sin(a)sin(-b)= -2sin(a)×(-sin(b))=2sin(a)sin(b)