Mathematics

Mathematics

Problem

Which of the following identities is always true for every admissible value of θ\theta? a) tan⁡2θ+1=csc⁡2θ\tan^{2}\theta+1=\csc^{2}\theta b) sin⁡2θ+cos⁡2θ=sec⁡θ\sin^{2}\theta+\cos^{2}\theta=\sec\theta c) cos⁡θ sec⁡θ=1\cos\theta\,\sec\theta=1 d) 1+cot⁡2θ=sec⁡2θ1+\cot^{2}\theta=\sec^{2}\theta

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