The integrating factor of the differential equation $(x\log_ex)\frac{dy}{dx}+y=2\log_ex$ is |
$\log_ex$ $x$ $\frac{1}{x}$ $\frac{1}{\log_ex}$ |
$\log_ex$ |
The correct answer is Option (1) → $\log_ex$ $ (x\log_{e}x)\frac{dy}{dx}+y=2\log_{e}x $ $\text{Rewrite in standard form: }$ $ \frac{dy}{dx}+\frac{1}{x\log_{e}x}\,y=\frac{2}{x} $ $\text{Here } P(x)=\frac{1}{x\log_{e}x}. $ $\text{Integrating factor } IF=e^{\int P(x)\,dx} =e^{\int \frac{1}{x\log_{e}x}\,dx } $ $ \int \frac{1}{x\log_{e}x}\,dx =\log(\log_{e}x) $ therefore $ IF=e^{\log(\log_{e}x)}=\log_{e}x $ The integrating factor is $\log_{e}x$. |