Выбери верный ответ

\(\dfrac{\sin\left( \dfrac{3\pi}2+\alpha\right)}{\ctg(2\pi-\alpha)}\cdot\dfrac{\tg\left(\dfrac{\pi}2+\alpha\right)}{\sin(\pi+\alpha)}=\)

• \(\sin \alpha\)
• \(\cos \alpha\)
• \(\tg \alpha\)
• \(\ctg \alpha\)
• \(-\sin \alpha\)
• \(-\cos \alpha\)
• \(-\tg \alpha\)
• \(-\ctg \alpha\)