Trigonometry
Which of the following expressions is equivalent to sin78∘cos34∘−cos78∘sin34∘\sin78^{\circ}\cos34^{\circ}-\cos78^{\circ}\sin34^{\circ}sin78∘cos34∘−cos78∘sin34∘?
sin44∘\sin44^{\circ}sin44∘
sin112∘\sin112^{\circ}sin112∘
cos44∘\cos44^{\circ}cos44∘
tan112∘\tan112^{\circ}tan112∘