sin^2a-1=sin^2a-(sin^2a+cos^2a)=-cos^2a
-cos^2a/cos^4a=-1/cos^2a
tg^2a-1/cos^2a=sin^2a/cos^2a-1/cos^a=-cos^2a/cos^2a=-1
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sin^2a-1=sin^2a-(sin^2a+cos^2a)=-cos^2a
-cos^2a/cos^4a=-1/cos^2a
tg^2a-1/cos^2a=sin^2a/cos^2a-1/cos^a=-cos^2a/cos^2a=-1