Упростите выражение:
sin^2a+(sin(п-a)cos(п/2-a)/tg)п+a)ctg(3п/2-a), a[tex] \neq [/tex] пn/2, nЄZ.

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