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[tex] \frac{cos( \frac{5 \pi - 2 \alpha }{2} ) * ctg( \frac{2a-3 \pi }{2} )}{sin( \alpha -3 \pi )} [/tex]
[tex] \frac{cos( \frac{5 \pi - 2 \alpha }{2} ) * ctg( \frac{2a-3 \pi }{2} )}{sin( \alpha -3 \pi )} [/tex]
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