Ответ:
1) cos(a-b)-cos(a+b)= -2sin(a)sin(-b)=-2sin(a)*(-sin(b))=2sin(a)sin(b)
2)=== -
Объяснение:
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Ответ:
1) cos(a-b)-cos(a+b)= -2sin(a)sin(-b)=-2sin(a)*(-sin(b))=2sin(a)sin(b)
2)=
=
= -
Объяснение: