1 - 2sin^2 alfa = 2cos^2 alfa -1
L=1-2(1-cos^2)
L=1-2+2cos^2
L=2COS^2 -1
L=P
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1 - 2sin^2 alfa = 2cos^2 alfa -1
L=1-2(1-cos^2)
L=1-2+2cos^2
L=2COS^2 -1
L=P