Which of the following is identically equal to for every acute angle ?

MATHEMATICS · Single correct · CBSE · Mathematics · Introduction to Trigonometry · Introduction to Trigonometry

Problem

Which of the following is identically equal to cos⁡2θ\cos^2 \theta for every acute angle θ\theta? (a) 1+sin⁡2θ1+\sin^2 \theta (b) 1−tan⁡2θ1-\tan^2 \theta (c) 1−sin⁡2θ1-\sin^2 \theta (d) sec⁡2θ−1\sec^2 \theta-1

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