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L=(cos²α/cos²α-sin²α/cos²α)/(cos²α/cos²α+sin²α/cos²α)
L=[cos²α-sin²α)/cos²α]/[(cos²α+sin²α)/cos²α]
L=[(cos²α-sin²α)/cos²α]*(1/c0s²α)
L=[(cos²α-sin²α)/cos²α]*cos²α
L=cos²α-sin²α
L=1-sin²α-sin²α
L=1-2sin²α a zatem L=P
(wykorzystano wzory tgα=sinα/cosα ; sin²α+cos²α=1