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Question: Answered & Verified by Expert
The integrating factor of the differential equation $\frac{d y}{d x}(x \log x)+y=2 \log x$ is given by
MathematicsDifferential EquationsMHT CETMHT CET 2011
Options:
  • A $e^{x}$
  • B $\log x$
  • C $\log (\log x)$
  • D $x$
Solution:
1862 Upvotes Verified Answer
The correct answer is: $\log x$
$\begin{aligned} & \frac{d y}{d x}(x \log x)+y=2 \log x \\ & \Rightarrow \quad \frac{d y}{d x}+\frac{y}{x \log x}=\frac{2}{x} \end{aligned}$
Here, $\quad P=\frac{1}{x \log x}, Q=\frac{2}{x}$
IF
$$
=e^{\int P d x}=e^{\int \frac{d x}{x \log x}}
$$
$=\log x$

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