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Elumi123
@Elumi123
July 2022
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1 - cos²α + sin²α / 1 + cos2α-sin2α
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(1 - cos²α + sin²α) / (1 + cos2α-sin2α) = (cos²α + sin²α- cos²α + sin²α)/(cos²α + sin²α + cos²α - sin²α - 2*cosα*sinα) = (2*sin²α)/(2*cos²α - 2*cosα*sinα) = sin²α/(cos²α - cosα*sinα) = [поделили числитель и знаменатель на cos²α] = tg²α/(1-tgα) = [поделили числитель и знаменатель на tgα] = tgα/(ctgα-1)
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