Тригонометрия. Упростить выражение.
[tex] \frac{cos( \pi - \alpha) +cos( \frac{3 \pi }{2}+ \alpha )}{1+2cos(- \alpha )sin(- \alpha )} [/tex]
[tex] \frac{cos( \pi - \alpha) +cos( \frac{3 \pi }{2}+ \alpha )}{1+2cos(- \alpha )sin(- \alpha )} [/tex]
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