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JEE Mains · Maths · STD 11 - 12. limits

यदि \(\lim _{x \rightarrow 0} \frac{a e^{x}-b \cos x+c e^{-x}}{x \sin x}=2\) है, तो \(a+b+c\) बराबर है .......... |

  1. A \(2\)
  2. B \(5\)
  3. C \(6\)
  4. D \(4\)
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Answer & Solution

Correct Answer

(D) \(4\)

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Detailed explanation

\(\lim _{x \rightarrow 0} \frac{a e^{x}-b \cos x+c e^{-x}}{x \sin x}=2\) \(\Rightarrow \lim _{x \rightarrow 0} \frac{a\left(1+x+\frac{x^{2}}{2 !} \ldots\right)-b\left(1-\frac{x^{2}}{2 !}+\ldots\right)+c\left(1-x+\frac{x^{2}}{2 !}\right)}{\left(\frac{x \sin x}{x}\right) x}=2\)…
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