Mathematics

Mathematics

Problem

Which expression equals ddx(sec⁡x csc⁡x)\dfrac{d}{dx}\bigl(\sec x\,\csc x\bigr) ? a) −sec⁡x csc⁡x (tan⁡x−cot⁡x)-\sec x\,\csc x\,(\tan x-\cot x) b) sec⁡x csc⁡x tan⁡x\sec x\,\csc x\,\tan x c) sec⁡x csc⁡x (tan⁡x−cot⁡x)\sec x\,\csc x\,(\tan x-\cot x) d) sec⁡x csc⁡x (tan⁡x+cot⁡x)\sec x\,\csc x\,(\tan x+\cot x)

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