Which of the following equation is non-linear

1.	Which of the following equation is non-linear
A.	\[\frac{dy}{dx}+\frac{y}{x}=\log x\]
B.	\[y\frac{dy}{dx}+4x=0\]
C.	\[dx+dy=0\]
D.	\[\frac{dy}{dx}=\cos x\]
Answer» C. \[dx+dy=0\]

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Which of the following equation is non-linear

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