Ответ: cos79 = cos(90-11) = sin11
cos11cos79 = cos11sin11 = 0.5sin22
Sin15Cos7-Cos11Cos79 = 0.5sin(15-7) + 0.5sin(15+7) - 0.5sin22 = 0.5sin8
Объяснение:
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Ответ: cos79 = cos(90-11) = sin11
cos11cos79 = cos11sin11 = 0.5sin22
Sin15Cos7-Cos11Cos79 = 0.5sin(15-7) + 0.5sin(15+7) - 0.5sin22 = 0.5sin8
Объяснение: