English

Lim X → π 4 C O S E C 2 X − 2 Cot X − 1

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Question

\[\lim_{x \to \frac{\pi}{4}} \frac{{cosec}^2 x - 2}{\cot x - 1}\]

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Solution

\[\lim_{x \to \frac{\pi}{4}} \left[ \frac{{cosec}^2 x - 2}{\cot x - 1} \right]\]
\[ = \lim_{x \to \frac{\pi}{4}} \left[ \frac{1 + \cot^2 x - 2}{\cot x - 1} \right]\]
\[ = \lim_{x \to \frac{\pi}{4}} \left[ \frac{\cot^2 x - 1}{\cot x - 1} \right]\]
\[ = \lim_{x \to \frac{\pi}{4}} \left[ \frac{\left( \cot x - 1 \right) \left( \cot x + 1 \right)}{\left( \cot x - 1 \right)} \right]\]
\[ = \cot \frac{\pi}{4} + 1\]
\[ = 2\]

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Chapter 29: Limits - Exercise 29.9 [Page 65]

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R.D. Sharma Mathematics [English] Class 11
Chapter 29 Limits
Exercise 29.9 | Q 2 | Page 65

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