Упростить выражение:
[tex]а) \frac{ 1 - cos2 \alpha }{sin( \pi +2 \alpha )} * tg( \frac{ \pi }{2} + \alpha )[/tex]
б) [tex]ctg( \pi П+a) \frac{cos(\frac{3 \pi }{2} - 2 \alpha )}{1+cos2a}[/tex]
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