Question 18 - CBSE Class 12 Sample Paper for 2022 Boards (MCQ Based - for Term 1) - Solutions of Sample Papers and Past Year Papers - for Class 12 Boards

Last updated at Dec. 16, 2024 by Teachoo

If y = log⁡(cos⁡ e ^x ), then dy/dx is :

(a) cose ^(x-1) (b) e ^(-x) cos e ^x
(c) e ^x sine ^x (d) -e ^x tan e ^x

This question is inspired from Ex 5.4, 5 - Chapter 5 Class 12 - Continuity and Differentiability

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Transcript

Question 18 If y = 𝑙𝑜𝑔⁡(𝑐𝑜𝑠⁡〖𝑒^𝑥 〗 ), then 𝑑𝑦/𝑑𝑥 is : (a) 𝑐𝑜𝑠𝑒^(𝑥−1) (b) 𝑒^(−𝑥) "cos" 𝑒^𝑥 (c) 𝑒^𝑥 𝑠𝑖𝑛𝑒^𝑥 (d) 〖−𝑒〗^𝑥 " tan" 〖 𝑒〗^𝑥 Given 𝑦 = 〖log 〗⁡(cos⁡〖𝑒^𝑥 〗 ) Differentiating both sides 𝑤.𝑟.𝑡.𝑥 𝑑(𝑦)/𝑑𝑥 = 𝑑(〖log 〗⁡(cos⁡〖𝑒^𝑥 〗 ) )/𝑑𝑥 𝑑𝑦/𝑑𝑥 = 1/cos⁡〖𝑒^𝑥 〗 . 𝑑(cos⁡〖𝑒^𝑥 〗 )/𝑑𝑥 = 1/cos⁡〖𝑒^𝑥 〗 . (−sin⁡〖𝑒^𝑥 〗 ) . 𝑑(𝑒^𝑥 )/𝑑𝑥 = 1/cos⁡〖𝑒^𝑥 〗 . (−sin⁡〖𝑒^𝑥 〗 ) . 𝑒^𝑥 = (−sin⁡〖𝑒^𝑥 〗)/cos⁡〖𝑒^𝑥 〗 . 𝑒^𝑥 = −tan⁡〖𝑒^𝑥 〗 . 𝑒^𝑥 = −𝒆^𝒙 . 𝒕𝒂𝒏⁡〖𝒆^𝒙 〗 So, the correct answer is (D)

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo

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