diff-equation

Question: Which of the following equation is non-linear



1) $\frac{dy}{dx}=\cos x$
2) $\frac{{{d}^{2}}y}{d{{x}^{2}}}+y=0$
3) $dx+dy=0$
4) $x\frac{dy}{dx}+\frac{3}{\frac{dy}{dx}}={{y}^{2}}$
Solution: Explanation: No Explanation
Linear differential equations

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