Question

Помогите плиз плиз плиз плиз​

Answer 1

$\frac{\sin{(\pi-\alpha)}-\cos{(\frac{3\pi}{2}-\alpha)}}{\cos{(\frac{\pi}{2}-\alpha)}} =\frac{\sin{\alpha}-(-\sin{\alpha)}}{\sin{\alpha}}=\frac{2\sin{\alpha}}{\sin{\alpha}}=2$