Выполни задание

Упрости выражение:

1. \(\dfrac{\cos (30\degree +\alpha )-\sin (60\degree +\alpha)}{\cos (30\degree -\alpha )-\sin (60\degree -\alpha)}\) ;

2. \(\dfrac{\cos 14\degree \cos 23\degree -\sin 14\degree \sin 23\degree}{\sin 56\degree \cos 19\degree -\cos 56\degree \sin 19\degree}\) .