differentiation

Question: $\frac{{{d}^{2}}x}{d{{y}^{2}}}$ is equal to

1) $\frac{1}{{{(dy/dx)}^{2}}}$

2) $\frac{\left( {{d}^{2}}y/d{{x}^{2}} \right)}{{{\left( dy/dx \right)}^{2}}}$

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

4) $\frac{\left( -{{d}^{2}}y/d{{x}^{2}} \right)}{{{\left( dy/dx \right)}^{2}}}$

Solution:

Explanation: No Explanation

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