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JEE Advanced 2018Paper 2
Exam
JEE Advanced
Year
2018
Paper
Paper 2
Subject
Mathematics
Chapter
Functions

JEE Advanced 2018 · Paper 2 · Mathematics · Functions

Let E _ 1 = x ∈ ℝ: x ≠ 1 and (x)/(x - 1) > 0 and E _ 2 = x ∈ E _ 1...

Let E1={E}_{1} ={x∈R:x≠1andx \in \mathbb{R}: x \ne 1 and\dfrac{x}{x - 1} > 0} and{E}_{2} =x∈E1:sin⁡−1(log⁡e(xx−1))isarealnumber{x \in {E}_{1}: \sin^{- 1}\left(\log_{e}\left(\dfrac{x}{x - 1}\right)\right) is a real number}

(Here the inverse trigonometric function sin⁡−1(x)\sin^{- 1}\left(x\right) assumes values in \left[- \dfrac{\pi}{2} . \dfrac{\pi}{2}\right].)<br/>Let.)<br />Letf: {E}_{1} \to \mathbb{R}bethefunctiondefinedbybe the function defined byf\left(x\right) = \log_{e} \left(\dfrac{x}{x - 1}\right)<br/>And<br />Andg: {E}_{2} \to \mathbb{R}bethefunctiondefinedbybe the function defined byg\left(x\right) = \sin^{- 1} \left(\log_{e} \left(\dfrac{x}{x - 1}\right)\right).</p><tableborder="1"><tbody><tr><td>LIST−I</td><td>LIST−II</td></tr><tr><td>A.Therangeof.</p><table border="1"> <tbody> <tr> <td>LIST-I</td> <td>LIST-II</td> </tr> <tr> <td>A. The range offis</td><td>P.(−∞,11−e]∪[ee−1,∞)is</td> <td>P. \left(- \infty, \dfrac{1}{1 - e}\right] \cup \left[\dfrac{e}{e - 1}, \infty\right) B. The range of gg contains Q. (0, 1) C. The domain of ff contains R. \left[- \dfrac{1}{2}, \dfrac{1}{2}\right]</td></tr><tr><td>D.Thedomainof</td> </tr> <tr> <td>D. The domain ofgis</td><td>S.(−∞,0)∪(0,∞)is</td> <td>S. \left(- \infty, 0\right) \cup \left(0, \infty\right) T. \left(- \infty, \dfrac{e}{e - 1}\right]</td></tr><tr><td></td><td>U.</td> </tr> <tr> <td> </td> <td>U.( - \infty, 0 ) \cup ( \dfrac{1}{2} , \dfrac{e}{e - 1} ]$ The correct option is:Let E _ 1 = x ∈ ℝ: x ≠ 1 and (x)/(x - 1) > 0 and E _ 2 = x ∈ E _ 1 : ^ - 1 ( _ e ((x)/(x - 1))) is a real number (HereLet E _ 1 = x ∈ ℝ: x ≠ 1 and (x)/(x - 1) > 0 and E _ 2 = x ∈ E _ 1 : ^ - 1 ( _ e ((x)/(x - 1))) is a real number (HereLet E _ 1 = x ∈ ℝ: x ≠ 1 and (x)/(x - 1) > 0 and E _ 2 = x ∈ E _ 1 : ^ - 1 ( _ e ((x)/(x - 1))) is a real number (Here

Options

  1. Aa-p;b-s;c-r;d-q;
  2. Ba-u;b-p;c-t;d-r;
  3. Ca-q;b-r;c-p;d-u;
  4. Da-s;b-q;c-p;d-p;

Correct answer

D. a-s;b-q;c-p;d-p;

Step-by-step solution

{E}_{1}: \dfrac{x}{x - 1} > 0<br><imgsrc="https://cdn−question−pool.getmarks.app/pyq/jeeadvanced/ehcgdgaijlqtberjqsqvnkjovrvuafptzaouazwsspezyriunt.png"/><br><br ><img src="https://cdn-question-pool.Quantrex.app/pyq/jee_advanced/ehcgdgaijlqtberjqsqvnkjovrvuafptzaouazwsspezyriunt.png"/><br >⇒ {E}_{1}: x \in \left(- \infty, 0\right) \cup \left(1, \infty\right)<br><br >{E}_{2}: - 1 \le \ln \left(\dfrac{x}{x + 1}\right) \le 1<br><br >\dfrac{1}{e} \le \dfrac{x}{x - 1} \le e<br>Now<br >Now\dfrac{x}{x - 1} - \dfrac{1}{e} \ge 0<br><br >⇒ \dfrac{\left(e - 1\right)x + 1}{e\left(x - 1\right)} \ge 0<br><imgsrc="https://cdn−question−pool.getmarks.app/pyq/jeeadvanced/poivsvjutbssqhdrmnybbwakudfjvfewjgtkmyonhmxpvywgza.png"/><br><br ><img src="https://cdn-question-pool.Quantrex.app/pyq/jee_advanced/poivsvjutbssqhdrmnybbwakudfjvfewjgtkmyonhmxpvywgza.png"/><br >⇒ xϵ\left(- \infty, \dfrac{1}{1 - e}\right] \cup \left(1, \infty\right)<br>Also<br >Also\dfrac{x}{x - 1} - e \le 0<br><br >\dfrac{\left(e - 1\right)x - e}{x - 1} \ge 0<br><imgsrc="https://cdn−question−pool.getmarks.app/pyq/jeeadvanced/mwditdcilihbfhuxyfegatzzwrpfqfmbldgzhcmpdxevjecvmv.png"/><br><br ><img src="https://cdn-question-pool.Quantrex.app/pyq/jee_advanced/mwditdcilihbfhuxyfegatzzwrpfqfmbldgzhcmpdxevjecvmv.png"/><br >⇒ x \in \left(- \infty, \dfrac{1}{1 - e}\right] \cup \left[\dfrac{e}{e - 1}, \infty\right]<br>AsRangeof<br >As Range of\dfrac{x}{x - 1}isis{R}^{+} - \left\{1\right\}<br><br >⇒RangeofRange offisisR - \left\{0\right\}or(−∞,0)∪(0,∞)or \left(- \infty, 0\right) \cup \left(0, \infty\right)
Range of gg is \left[– \dfrac{\pi}{2}, \dfrac{\pi}{2}\right] - \left\{0\right\}or[–π2,0)∪(0,π2]or \left[– \dfrac{\pi}{2}, 0\right) \cup \left(0, \dfrac{\pi}{2}\right]
Now P→4,Q→2,R→1,S→1P \to 4, Q \to 2, R \to 1, S \to 1
Hence AA is correct.
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