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Problem Which of the following expressions is equal to cos ( x − y ) \cos(x-y) cos ( x − y ) x x x y y y cos x cos y − sin x sin y \cos x\cos y-\sin x\sin y cos x cos y − sin x sin y sin x cos y − cos x sin y \sin x\cos y-\cos x\sin y sin x cos y − cos x sin y cos x cos y + sin x sin y \cos x\cos y+\sin x\sin y cos x cos y + sin x sin y cos x cos y \cos x\cos y cos x cos y Browse the problem library