Упростите выражение:
[tex]sin ^{2} \alpha + \frac{sin( \pi - \alpha )cos( \frac{\pi} {2}-a) }{tg( \pi + \alpha )ctg( \frac{3\pi}{2}-a) } [/tex], [tex]a \neq \frac{ \pi n}{2} [/tex], nЄZ.
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