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L:[sinx*(1+cosx)+sinx*(1-cosx)]/(1-cosx)(1+cosx)=
[sinx+sinxcosx+sinx-sinxcosx]/(1+cosx-cosx-cos²x)=
[2sinx]/(1-cos²x)=2sinx/sin²x=2/sinx
zatem L=P
b)(1−sinα/sinα)*(1+sinα/cosα)=ctgα
L:[(1+sinα-sinα-sin²α)/sinαcosα)]=
1-sin²α/sinαcosα=
cos²α/sinacosa=
cosα/sinα=ctgα
zatem L=P