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Wykaż podaną tożsamość
L=1+tg^2a=1+sin^2a /cos^2a= (cos^2a+sin^2a)/cos^2a=1/cos^2a
L=P
* ^2 - kwadrat
* /- kreska ułamkowa
(cos2a+sin2a)/cos2a=1/cos2a
P=1/cos2a
P=L