Question

Cos15°cos30°-sin15°sin30/
Sin60°cos15°-cos60°sin15

Answer 1

$\frac{\cos15а\cos30а-\sin15а\sin30а}{\sin60а\cos15а-\cos60а\sin15а} = \frac{\cos(15а+30а)}{\sin(60а-15а)}= \frac{\cos45а}{\sin45а} =ctg45а=1$