Sprawdź tożsamości:
a) (tgα-1) (ctgα+1) = tgα - ctgα
b) 1 + ctgα = (sinα+cosα) / sinα
L=tga*ctga+tga-ctga-1=sina/cosa*cosa/sina+tga-ctga-1=1+tga-ctga-1=tga-ctga=P
P=sina/sina+cosa/sina=1+ctga=L
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L=tga*ctga+tga-ctga-1=sina/cosa*cosa/sina+tga-ctga-1=1+tga-ctga-1=tga-ctga=P
P=sina/sina+cosa/sina=1+ctga=L