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-- Mathematics - Section B1
Differential Equations
Integrating factor of $\frac{d y}{d x}+\frac{y}{x}=x^3-3$; (x > 0) is :
x
log x
-x
ex
I.F. $=e^{\int \frac{1}{x} d x}=e^{\log x}=x$
Hence (1) is the correct answer.