sin²β+cos²β+tg²β=1+tg²β= 1\cos²β
sin^2b+cos^2b+tg^2b=1+tg^2b=(cos^2b)^-1=1/cos^2b
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sin²β+cos²β+tg²β=1+tg²β= 1\cos²β
sin^2b+cos^2b+tg^2b=1+tg^2b=(cos^2b)^-1=1/cos^2b