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If y=a x^(n)+b x^(-n),then x^2(d^2y)/(d...

If `y=a x^(n)+b x^(-n)`,then
`x^2(d^2y)/(dx^2)` is equal to

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`y=ax^(n+1)+bx^(-n)`
`"or "(dy)/(dx)=(n+1)ax^(n)-nbx^(-n-1)`
`"or "(d^(2)y)/(dx^(2))=n(n+1)ax^(n-1)+n(n+1)bx^(-n-2)`
`"or "x^(2)(d^(2)y)/(dx^(2))=n(n+1)y`
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