Упростите выражение:
\(\LARGE{\frac{\sin(\pi+\alpha)\cdot\ctg(\pi-\alpha)}{\cos(\frac{\pi}{2}-\alpha)\cdot\sin(\frac{3\pi}{2}-\alpha)}}\)

• \(\LARGE{-\frac{1}{\sin\alpha}}\)
• \(\LARGE{\frac{1}{\sin\alpha}}\)
• \(\Large{(\sin\alpha)^2}\)
• \(\LARGE{\sin\alpha}\)