diff-equation

Question: Integrating factor of equation $({{x}^{2}}+1)\frac{dy}{dx}+2xy={{x}^{2}}-1$ is



1) ${{x}^{2}}+1$
2) $\frac{2x}{{{x}^{2}}+1}$
3) $\frac{{{x}^{2}}-1}{{{x}^{2}}+1}$
4) None of these
Solution: Explanation: No Explanation
Linear differential equations

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