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Lim X → 1 ( 1 X − 1 − 2 X 2 − 1 )

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Question

\[\lim_{x \to 1} \left( \frac{1}{x - 1} - \frac{2}{x^2 - 1} \right)\]

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Solution

\[\lim_{x \to 1} \left[ \frac{1}{x - 1} - \frac{2}{x^2 - 1} \right]\]
\[ = \lim_{x \to 1} \left[ \frac{1}{x - 1} - \frac{2}{\left( x - 1 \right)\left( x + 1 \right)} \right]\]
\[ = \lim_{x \to 1} \left[ \frac{x + 1 - 2}{\left( x - 1 \right)\left( x + 1 \right)} \right]\]
\[ = \lim_{x \to 1} \left[ \frac{\left( x - 1 \right)}{\left( x - 1 \right)\left( x + 1 \right)} \right]\]
\[ = \lim_{x \to 1} \left[ \frac{1}{x + 1} \right]\]
\[ = \frac{1}{1 + 1}\]
\[ = \frac{1}{2}\]

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Chapter 29: Limits - Exercise 29.3 [Page 23]

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R.D. Sharma Mathematics [English] Class 11
Chapter 29 Limits
Exercise 29.3 | Q 23 | Page 23

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