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Derivatives & Second-Order Derivatives · Question 26 of 96

Match each function in List I with its derivative in List II.

Question 26

MediumOriginal question

Match each function in List I with its derivative in List II.

List IList II
A. tan⁡x\tan xI. sec⁡xtan⁡x\sec x\tan x
B. sec⁡x\sec xII. −cosec⁡xcot⁡x-\operatorname{cosec} x\cot x
C. cot⁡x\cot xIII. sec⁡2x\sec^{2} x
D. cosec⁡x\operatorname{cosec} xIV. −cosec⁡2x-\operatorname{cosec}^{2} x
Options for question 26

Show the answer and explanation
CorrectNot quiteAnswer B

Correct answer: B

Explanation

  1. ddxtan⁡x=sec⁡2x\frac{d}{dx}\tan x = \sec^{2} x and ddxsec⁡x=sec⁡xtan⁡x\frac{d}{dx}\sec x = \sec x\tan x.

  2. The co-functions carry a minus sign: ddxcot⁡x=−cosec⁡2x\frac{d}{dx}\cot x = -\operatorname{cosec}^{2} x and ddxcosec⁡x=−cosec⁡xcot⁡x\frac{d}{dx}\operatorname{cosec} x = -\operatorname{cosec} x\cot x.

Concept
Derivatives of trigonometric functions
Typical time
120 s
Your time
—
The rule this testsThe rules of differentiation
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Ten questions from Derivatives & Second-Order Derivatives, at your own pace.

Practise this chapter →

Ten questions from Derivatives & Second-Order Derivatives, at your own pace.