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