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