sin(π – α) + cos 27) π (+α) + ctg(π – α) tg (3π – α) 2

27)

$$\frac{sin(\pi - \alpha) + cos(\frac{\pi}{2} + \alpha) + ctg(\pi - \alpha)}{tg(\frac{3\pi}{2} - \alpha)} =$$ $$\frac{sin \alpha - sin \alpha - ctg \alpha}{ctg \alpha} = -1$$

sin(π – α) = sin α

cos (π/2 + α) = -sin α

ctg(π – α) = - ctg α

tg (3π/2 – α) = ctg α

Ответ: -1