sin2α = 2sinα × cosα
cos2α = cos²α - sin²α
cos2α = 2cos²α - 1
cos2α = 1 - 2sin²α
tg2α =
ctg2α =
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sin2α = 2sinα × cosα
cos2α = cos²α - sin²α
cos2α = 2cos²α - 1
cos2α = 1 - 2sin²α
tg2α =
ctg2α =