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JEE PYQ: Limits Question 23

Question 23 - 2019 (09 Apr Shift 2)

If $f : \mathbb{R} \to \mathbb{R}$ is a differentiable function and $f(2) = 6$, then $\lim_{x \to 2} \frac{\int_6^{f(x)} \frac{2t,dt}{x-2}}{1}$ is:

(1) $24f’(2)$

(2) $2f’(2)$

(3) $0$

(4) $12f’(2)$

Show Answer

Answer: (4)

Solution

Using L’Hospital rule and Leibnitz theorem: $\lim_{x\to 2}\frac{2f(x)f’(x) - 0}{1} = 2f(2)f’(2) = 2 \cdot 6 \cdot f’(2) = 12f’(2)$.


Learning Progress: Step 23 of 35 in this series