L=(1+sin alfa)((1/cos alfa)-(1/ctg alfa))= (1+sin alfa)(1/cos alfa)-(1+sin alfa)(sin alfa/cos alfa)= 1/cos alfa+sin alfa/cos alfa)-sin alfa/cos alfa-sin (2)alfa/cos alfa= 1/cos alfa-sin(2) alfa/cos alfa=cos(2)alfa/cos alfa=cos alfa=P
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L=(1+sin alfa)((1/cos alfa)-(1/ctg alfa))= (1+sin alfa)(1/cos alfa)-(1+sin alfa)(sin alfa/cos alfa)= 1/cos alfa+sin alfa/cos alfa)-sin alfa/cos alfa-sin (2)alfa/cos alfa= 1/cos alfa-sin(2) alfa/cos alfa=cos(2)alfa/cos alfa=cos alfa=P