cos 30∘ cos 60∘−sin 30∘ sin 60∘= __________________

1.	cos 30∘ cos 60∘−sin 30∘ sin 60∘= __________________
Answer» $c o s 30^{\circ} c o s 60^{\circ} - s i n 30^{\circ} s i n 60^{\circ}$ = __________________

Discussion