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∫ √ 16 + ( Log X ) 2 X D X - Mathematics

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Question

\[\int\frac{\sqrt{16 + \left( \log x \right)^2}}{x} \text{ dx}\]
Sum
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Solution

\[\text{ Let I }= \int\sqrt{\frac{16 + \left( \log x \right)^2}{x}}\text{ dx}\]
\[\text{ Putting  log x }= t\]
\[ \Rightarrow \frac{1}{x} \text{ dx}= dt\]
\[ \therefore I = \int\sqrt{16 + t^2}dt\]
\[ = \int\sqrt{4^2 + t^2}dt\]
\[ = \frac{t}{2} \sqrt{4^2 + t^2} + \frac{4^2}{2} \text{ log} \left| t + \sqrt{4^2 + t^2} \right| + C\]
\[ = \frac{\log x}{2} \sqrt{16 + \left( \log x \right)^2} + 8 \text{ log }\left| \log x + \sqrt{16 + \left( \log x \right)^2} \right| + C\]

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Chapter 19: Indefinite Integrals - Exercise 19.28 [Page 154]

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RD Sharma Mathematics [English] Class 12
Chapter 19 Indefinite Integrals
Exercise 19.28 | Q 14 | Page 154

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