Преобразуйте произвдение в сумму.Срочно!
1) sin40°cos20°
2) 2cos80°sin20°
3) 2sin10°cos100°
4) cos12°sin6°
5) 2cos70°cos40°
6) sin55°sin17°
7) cos4xcos6x
8)sin3xsin17x
9)4cos Пи/5 sin3Пи/10
10)sin(x-y)cos(x+y)
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