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[tex] \frac{4cos^2 \alpha }{ctg \frac{ \alpha }{2}-tg \frac{ \alpha }{2} }=sin2 \alpha [/tex]
[tex] \frac{4cos^2 \alpha }{ctg \frac{ \alpha }{2}-tg \frac{ \alpha }{2} }=sin2 \alpha [/tex]
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