# ∫ Log 10 X D X - Mathematics

Sum
$\int \log_{10} x\ dx$

#### Solution

$\int \log_{10} x \text{ dx }$
$= \int\frac{\log x}{\log 10}dx$
$= \frac{1}{\log 10}\int 1_{} \cdot \text{ log x dx }$
  " Taking log x as the first function and 1 as the second function "
$= \frac{1}{\log 10}\left[ \log x \int\text{ 1 dx} - \int\left\{ \frac{d}{dx}\left( \log x \right)\int\text{ 1 dx }\right\}dx \right]$

$= \frac{1}{\log 10}\left[ \log x \cdot x - \int\frac{1}{x} \cdot \text{ x dx } \right]$
$= \frac{1}{\log 10}\left[ x \log x - x \right] + C$
$= \frac{1}{\log 10}\left[ x\left( \log x - 1 \right) \right] + C$

Concept: Indefinite Integral Problems
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#### APPEARS IN

RD Sharma Class 12 Maths
Chapter 19 Indefinite Integrals
Exercise 19.25 | Q 25 | Page 133