Identify the expression that is identically equal to for all in its domain.

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

Problem

Identify the expression that is identically equal to 11 for all xx in its domain. (a) csc⁡x−sin⁡x\csc x-\sin x (b) tan⁡2x+1\tan^{2}x+1 (c) sec⁡xcos⁡x\sec x\cos x (d) cot⁡x+tan⁡x\cot x+\tan x

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