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 {\dfrac{x}{x - 1} > 0} and{E}_{2} =
(Here the inverse trigonometric function assumes values in \left[- \dfrac{\pi}{2} . \dfrac{\pi}{2}\right]f: {E}_{1} \to \mathbb{R}f\left(x\right) = \log_{e} \left(\dfrac{x}{x - 1}\right)g: {E}_{2} \to \mathbb{R}g\left(x\right) = \sin^{- 1} \left(\log_{e} \left(\dfrac{x}{x - 1}\right)\right)f
Options
- Aa-p;b-s;c-r;d-q;
- Ba-u;b-p;c-t;d-r;
- Ca-q;b-r;c-p;d-u;
- 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⇒ {E}_{1}: x \in \left(- \infty, 0\right) \cup \left(1, \infty\right){E}_{2}: - 1 \le \ln \left(\dfrac{x}{x + 1}\right) \le 1\dfrac{1}{e} \le \dfrac{x}{x - 1} \le e\dfrac{x}{x - 1} - \dfrac{1}{e} \ge 0⇒ \dfrac{\left(e - 1\right)x + 1}{e\left(x - 1\right)} \ge 0⇒ xϵ\left(- \infty, \dfrac{1}{1 - e}\right] \cup \left(1, \infty\right)\dfrac{x}{x - 1} - e \le 0\dfrac{\left(e - 1\right)x - e}{x - 1} \ge 0⇒ x \in \left(- \infty, \dfrac{1}{1 - e}\right] \cup \left[\dfrac{e}{e - 1}, \infty\right]\dfrac{x}{x - 1}{R}^{+} - \left\{1\right\}⇒fR - \left\{0\right\}
Range of is \left[– \dfrac{\pi}{2}, \dfrac{\pi}{2}\right] - \left\{0\right\}
Now
Hence is correct.
Range of is \left[– \dfrac{\pi}{2}, \dfrac{\pi}{2}\right] - \left\{0\right\}
Now
Hence is correct.