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The Value of Lim X → π / 2 ( Sec X − Tan X ) is - Mathematics

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प्रश्न

The value of \[\lim_{x \to \pi/2} \left( \sec x - \tan x \right)\]is 

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उत्तर

\[\lim_{x \to \frac{\pi}{2}} \left( \sec x - \tan x \right)\]
\[ = \lim_{h \to 0} \left( \sec \left( \frac{\pi}{2} - h \right) - \tan \left( \frac{\pi}{2} - h \right) \right)\]
\[ = \lim_{h \to 0} \left( cosec h - \cot h \right)\]
\[ = \lim_{h \to 0} \frac{1 - \cos h}{\sin h}\]
\[ = \lim_{h \to 0} \frac{2 \sin^2 \frac{h}{2}}{\sin h}\]
\[ = \lim_{h \to 0} \frac{2 \sin^2 \frac{h}{2}}{2 \sin \frac{h}{2}\cos \frac{h}{2}}\]
\[ = \lim_{h \to 0} \tan \frac{h}{2}\]
\[ = 0\]

 

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पाठ 29: Limits - Exercise 29.13 [पृष्ठ ८०]

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आरडी शर्मा Mathematics [English] Class 11
पाठ 29 Limits
Exercise 29.13 | Q 34 | पृष्ठ ८०

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