Ответ:
1/2(cos(x+6)-cos(3x))
Объяснение:
sin(2 x + 3) sin(x - 3)=1/2(cos(2x+3-x+3)-cos(2x+3+x-3))=
=1/2(cos(x+6)-cos(3x))
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Answers & Comments
Ответ:
1/2(cos(x+6)-cos(3x))
Объяснение:
sin(2 x + 3) sin(x - 3)=1/2(cos(2x+3-x+3)-cos(2x+3+x-3))=
=1/2(cos(x+6)-cos(3x))
cos7a*cos(2п+9а)=....