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lim x → 3 x − 3 | x − 3 | , is equal to

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Question

\[\lim_{x \to 3} \frac{x - 3}{\left| x - 3 \right|},\] is equal to

Options

  •  1 

  • −1 

  •  0 

  • does not exist 

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Solution

does not exist 

\[\lim_{x \to 3} \frac{x - 3}{\left| x - 3 \right|}\]
\[\text{ LHL at } x = 3: \]
\[ \lim_{x \to 3^-} \frac{x - 3}{- \left( x - 3 \right)} \left[ \because \left| x - 3 \right| = - \left( x - 3 \right), \text{ when } x < 3 \right]\]
\[ \Rightarrow - 1\]
\[\text{ RHL at } x = 3: \]
\[ \lim_{x \to 3^+} \frac{x - 3}{x - 3} \left[ \because \left| x - 3 \right| = x - 3, \text{ when } x > 3 \right]\]
\[ = 1\]

LHL ≠ RHL
Therefore, limit does not exist. 

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Chapter 29: Limits - Exercise 29.13 [Page 78]

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R.D. Sharma Mathematics [English] Class 11
Chapter 29 Limits
Exercise 29.13 | Q 10 | Page 78

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