Identify the trigonometric function that equals for all real .

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

Problem

Identify the trigonometric function that equals 1−2sin⁡2θ1-2\sin^{2}\theta for all real θ\theta. (a) −cos⁡2θ-\cos 2\theta (b) sin⁡2θ\sin 2\theta (c) cos⁡2θ\cos 2\theta (d) cos⁡2θ\cos^{2}\theta

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