Which of the following trigonometric equations is already expressed as a direct…

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

Problem

Which of the following trigonometric equations is already expressed as a direct product of factors equal to zero? (a) cos⁡2x−sin⁡2x=0\cos^2 x - \sin^2 x = 0 (b) sin⁡xcos⁡x+cos⁡x=0\sin x \cos x + \cos x = 0 (c) sin⁡xcos⁡2x=0\sin x \cos 2x = 0 (d) sin⁡x+cos⁡x=0\sin x + \cos x = 0

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