diff-equation

Question: The differential equation of all parabolas whose axes are parallel to y-axis is

1) $\frac{{{d}^{3}}y}{d{{x}^{3}}}=0$

2) $\frac{{{d}^{2}}x}{d{{y}^{2}}}=c$

3) $\frac{{{d}^{3}}y}{d{{x}^{3}}}+\frac{{{d}^{2}}x}{d{{y}^{2}}}=0$

4) $\frac{{{d}^{2}}y}{d{{x}^{2}}}+2\frac{dy}{dx}=c$

Solution:

Explanation: No Explanation

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