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∘csin90∘\sin 90^\circsin90∘dsin45∘\sin 45^\circsin45∘ব্যাখ্যাThis is the expansion of sin(30∘+60∘)=sin90∘\sin(30^\circ+60^\circ)=\sin 90^\circsin(30∘+60∘)=sin90∘, which equals 111.