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tg2α=2tgα/1-tg² α
P = 2tgα/1-tg² α = 2sinα/cosα:(1 - sin²α/cos²α) =
= 2sinα/cosα:[(cos²α - sin²α)/cos²α] =
= 2sinα/cosα*[cos²α/cos²α - sin²α] =
= 2sinαcosα/(cos²α - sin²α) =
= sin2α/cos2α =
= tg2α = L