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Universalka

frac{Sin4alpha}{1+Cos4alpha}*frac{Cos2alpha}{1+Cos2alpha } =frac{2Sin2alpha Cos2alpha}{2Cos^{2}2alpha}*frac{Cos2alpha}{2Cos^{2}alpha} =frac{Sin2alpha}{Cos^{2}alpha}=frac{2Sinalpha Cosalpha}{Cos^{2}alpha}=frac{2Sinalpha }{Cosalpha}=2tgalpha

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