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[tex](tg^2a+ctg^a)* \frac{sin^2a}{tg^4a+1} =cos^2a[/tex]
[tex](tg^2a+ctg^a)* \frac{sin^2a}{tg^4a+1} =cos^2a[/tex]
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2)(tg^4a+1)/tg²a*sin²a/(tg^4a+1)=sin²a:sin²a/cos²a=sin²a*cos²a/sin²a=cos²a