differentiation

Question: If $y=a{{x}^{n+1}}+b{{x}^{-n}}$, then ${{x}^{2}}\frac{{{d}^{2}}y}{d{{x}^{2}}}=$



1) $n\,(n-1)y$
2) $n\,(n+1)y$
3) ny
4) ${{n}^{2}}y$
Solution: Explanation: No Explanation
Differentiation by substitution Higher order derivatives

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