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triggerbott

dfrac{sin^2alpha}{1+cosalpha}+cos alpha =dfrac{(1-cos alpha)(1+cos alpha )}{1+cos alpha}+cos alpha=1-cos alpha +cos alpha =1

dfrac{2sin^2alpha cdot {rm ctg}, alpha}{cos^2alpha-sin^2alpha}=dfrac{2sin alphacos alpha}{cos2alpha}=dfrac{sin2alpha}{cos 2alpha}={rm tg}, 2alpha

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