[tex]1)(sin \alpha +cos \alpha ) ^{2} -sin2 \alpha =1
2)tg \alpha + tg \beta = \frac{sin( \alpha + \beta )}{cos \alpha cos \beta } [/tex]
2)tg \alpha + tg \beta = \frac{sin( \alpha + \beta )}{cos \alpha cos \beta } [/tex]
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