Which of the following is a fundamental trigonometric identity valid for all acute…

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

Problem

Which of the following is a fundamental trigonometric identity valid for all acute angles θ\theta? (a) 1+tan⁡2θ=csc⁡2θ1+\tan^2\theta=\csc^2\theta (b) sin⁡2θ+cos⁡2θ=1\sin^2\theta+\cos^2\theta=1 (c) sec⁡θ−tan⁡θ=1\sec\theta-\tan\theta=1 (d) sin⁡θ+cos⁡θ=1\sin\theta+\cos\theta=1

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