JEE PYQ: Limits Question 2
Question 2 - 2021 (17 Mar Shift 1)
The value of $\lim_{x \to 0} \frac{\cos^{-1}(x - [x^2]) \cdot \sin^{-1}(x - [x^2])}{x - x^3}$, where $[x]$ denotes the greatest integer $\leq x$ is:
(1) $\frac{\pi}{2}$
(2) $0$
(3) $\frac{\pi}{4}$
(4) $\frac{\pi}{2}$
Show Answer
Answer: (4)
Solution
$\lim_{x \to 0} \frac{\cos^{-1}(x - [x^2])}{(1-[x^2])} \times \frac{\sin^{-1}(x-[x^2])}{x} = \frac{\pi}{2} \cdot 1 = \frac{\pi}{2}$.