Ответ:
cos40° cos20° = 1/2[cos(40° - 20°) + cos(40° + 20°) ] =
= 1/2[cos20° + cos60°] = (1/2)*cos20° + 1/4
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Ответ:
cos40° cos20° = 1/2[cos(40° - 20°) + cos(40° + 20°) ] =
= 1/2[cos20° + cos60°] = (1/2)*cos20° + 1/4
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