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August 2022
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решите пожалуйста!!!!!!!!
COS(A+П/4)*COS(A-П/4)
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nKrynka
COS(A+П/4)*COS(A-П/4) = (1/2)* [cos(
α + π/4 - α + π/4) + cos(α + π/4 + α - π/4)] =
= (1/2)* [ cos(π/2) + cos2α] = (1/2)*cos(2α)
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= (1/2)* [ cos(π/2) + cos2α] = (1/2)*cos(2α)