sprawdz czy rownosc jest rozsamoscia
(ctg^2-cos^2)*tg^2=cos^2
L=ctg^2*tg^2-cos^2*tg^2
L=1-cos^2* sin^2/cos^2
L=1-sin^2
L=cos^2
L=P
^2-tzn.do potęgi drugiej
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(ctg^2-cos^2)*tg^2=cos^2
L=ctg^2*tg^2-cos^2*tg^2
L=1-cos^2* sin^2/cos^2
L=1-sin^2
L=cos^2
L=P
^2-tzn.do potęgi drugiej