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L:
(1/cosx - 1/sinx) * (1 + tgx + ctgx ) = 1/cosx +tgx/cosx + ctgx/cosx - 1/sinx -tgx/sinx - ctgx/sinx = 1/cosx +sinx/cos²x + 1/sinx - 1/sinx - 1/cosx - cosx/sin²x = sinx/cos²x - cosx/sin²x
L=P