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JEE Main 202431 JanuaryMorning Shift
Exam
JEE Main
Year
2024
Date
31 January
Shift
Morning Shift
Subject
Mathematics
Chapter
Limits

JEE Main 2024 · 31 January · Morning Shift · Mathematics · Limits

_ x → 0 e ^ 2| x| - 2| x| - 1 x ^ 2

lim⁡x→0e2∣sin⁡x∣−2∣sin⁡x∣−1x2\lim_{x \to 0}\dfrac{{e}^{2\left|\sin x\right|} - 2\left|\sin x\right| - 1}{{x}^{2}}

Options

  1. Ais equal to −1- 1
  2. Bdoes not exist
  3. Cis equal to 11
  4. Dis equal to 22

Correct answer

D. is equal to 22

Step-by-step solution

Given, lim⁡x→0e2∣sin⁡x∣−2∣sin⁡x∣−1x2\lim_{x \to 0}\dfrac{{e}^{2\left|\sin x\right|} - 2\left|\sin x\right| - 1}{{x}^{2}}

Now, using the expansion of ex=1+x1!+x22!+........∞{e}^{x} = 1 + \dfrac{x}{1 !} + \dfrac{{x}^{2}}{2 !} + . . . . . . . . \infty we get,

=lim⁡x→0(1+∣2sin⁡x∣1!+∣2sin⁡x∣22!+.....∞)−∣2sin⁡x∣−1x2= \lim_{x \to 0}\dfrac{\left(1 + \dfrac{\left|2\sin x\right|}{1 !} + \dfrac{{\left|2\sin x\right|}^{2}}{2 !} + . . . . . \infty\right) - \left|2\sin x\right| - 1}{{x}^{2}}

=lim⁡x→0∣2sin⁡x∣22!+∣2sin⁡x∣33!.....∞x2= \lim_{x \to 0}\dfrac{\dfrac{{\left|2\sin x\right|}^{2}}{2 !} + \dfrac{{\left|2\sin x\right|}^{3}}{3 !} . . . . . \infty}{{x}^{2}}

=lim⁡x→02sin⁡2x+∣2sin⁡x∣33!.....∞x2= \lim_{x \to 0}\dfrac{2\sin^{2}x + \dfrac{{\left|2\sin x\right|}^{3}}{3 !} . . . . . \infty}{{x}^{2}}

=2{aslim⁡x→0sin⁡2xx2=1and other terms will become zero}= 2\left\{\text{as}\lim_{x \to 0}\dfrac{\sin^{2}x}{{x}^{2}} = 1\text{and other terms will become zero}\right\}

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