Mathematics

Mathematics

Problem

Which one of the following expressions is identically equal to 11 for all acute angles θ\theta? a) csc⁡2θ−cot⁡θ\csc^2\theta-\cot\theta b) sec⁡2θ−tan⁡2θ\sec^2\theta-\tan^2\theta c) sec⁡2θ+tan⁡2θ\sec^2\theta+\tan^2\theta d) sin⁡2θ+cos⁡θ\sin^2\theta+\cos\theta

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