cos200 = cos(180+20) = -cos20
cos40+cos80 = 2cos60cos20
Сокращаем на cos20 и получаем = -2cos60 = -2*1/2 = -1
Ответ: -1
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cos200 = cos(180+20) = -cos20
cos40+cos80 = 2cos60cos20
Сокращаем на cos20 и получаем = -2cos60 = -2*1/2 = -1
Ответ: -1