C-09-Q179mediumsingle_mcqsin30∘⋅cos60∘+cos30∘⋅sin60∘\sin 30^\circ \cdot \cos 60^\circ + \cos 30^\circ \cdot \sin 60^\circsin30∘⋅cos60∘+cos30∘⋅sin60∘ equals—asin30∘\sin 30^\circsin30∘bsin60∘\sin 60^\circsin60∘c