Which of the following expressions is equal to ?

MATHEMATICS · Single correct · A Level · Mathematics · Trigonometry · Trigonometry

Problem

Which of the following expressions is equal to sin⁡(x−y)\sin(x-y)? (a) sin⁡ycos⁡x−cos⁡ysin⁡x\sin y\cos x-\cos y\sin x (b) sin⁡xcos⁡y−cos⁡xsin⁡y\sin x\cos y-\cos x\sin y (c) sin⁡xcos⁡y+cos⁡xsin⁡y\sin x\cos y+\cos x\sin y (d) cos⁡xcos⁡y−sin⁡xsin⁡y\cos x\cos y-\sin x\sin y

Related theory

Browse the problem library