Sprawdź tożsamość sin/(1-cos)=(1+cos)/sin
sina / (1 - cosa) = (1 + cosa) / sina
(1 - cosa)(1 +cosa) = sina * sina
1 - cos^2a = sin^2a
sin^2a = sin^2a
L = P
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sina / (1 - cosa) = (1 + cosa) / sina
(1 - cosa)(1 +cosa) = sina * sina
1 - cos^2a = sin^2a
sin^2a = sin^2a
L = P