(tgx+ctgx)^2=tg^2x+ctg^2x+2(1-tgx)(1+ctgx)=ctgx-tgx
ctgx=1/tgx
ctgx*tgx=1
(tg²x+2*tgx*1/tgx+ctg²x)= tg²x+2+ctg²x
L=P
(1+ctgx-tgx-ctgx*tgx)=ctgx-tgx+1-1
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ctgx=1/tgx
ctgx*tgx=1
(tg²x+2*tgx*1/tgx+ctg²x)= tg²x+2+ctg²x
L=P
(1+ctgx-tgx-ctgx*tgx)=ctgx-tgx+1-1
L=P