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