Which of the following expresses entirely in terms of ?

MATHEMATICS · Single correct · CBSE · Mathematics · Trigonometric Functions · Trigonometric Functions

Problem

Which of the following expresses cos⁡2θ\cos^{2}\theta entirely in terms of cos⁡2θ\cos 2\theta? (a) 1−cos⁡2θ2\dfrac{1-\cos 2\theta}{2} (b) 21+cos⁡2θ\dfrac{2}{1+\cos 2\theta} (c) 1+cos⁡2θ2\dfrac{1+\cos 2\theta}{2} (d) 1−cos⁡2θ1-\cos 2\theta

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