Which of the following expressions equals ?

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

Problem

Which of the following expressions equals cos⁡2θ\cos 2\theta? (a) 2sin⁡θcos⁡θ2\sin\theta\cos\theta (b) 2cos⁡2θ+12\cos^{2}\theta+1 (c) 1−2sin⁡2θ1-2\sin^{2}\theta (d) 1+2sin⁡2θ1+2\sin^{2}\theta

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