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Lim X → 1 1 − X 2 Sin π X

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Question

\[\lim_{x \to 1} \frac{1 - x^2}{\sin \pi x}\]

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Solution

\[\lim_{x \to 1} \frac{1 - x^2}{\sin \pi x}\]
\[ \lim_{h \to 0} \frac{1 - \left( 1 - h \right)^2}{\sin \pi\left( 1 - h \right)}\]
\[ \lim_{h \to 0} \frac{2h - h^2}{\sin \pi h}\]
\[ = \lim_{h \to 0} \frac{h\left( 2 - h \right)}{\sin \pi h}\]
\[ = \lim_{h \to 0} \frac{\left( 2 - h \right)}{\pi \times \frac{\sin \pi h}{\pi h}}\]
\[ \Rightarrow \frac{2 - 0}{\pi} = \frac{2}{\pi}\]

 

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Chapter 29: Limits - Exercise 29.8 [Page 62]

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R.D. Sharma Mathematics [English] Class 11
Chapter 29 Limits
Exercise 29.8 | Q 21 | Page 62

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