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girl555555
@girl555555
September 2021
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cos (60- a) + cos (60+ a)
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kamyshova1996
cos (60-a) + cos ( 60+a) = cos60cosa + sin60sina + cos60cosa - sin60sina = 1/2cosa + корень из 3/2sina + 1/2cosa - корень из 3/2 = 1/2cosa + 1/2cosa.
Вроде так)
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Вроде так)