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The answer I got was by first finding the partial derivative with respect to r which I found to be 2r/(r^2 + s) and then I squared it and got 4r^2/(r^2 + s)^2 I plugged this into wolfram alpha and it gave a different answer, can someone explain what I'm doing wrong?

Original Question (Number 2)

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The second order derivative does not mean "take the derivative and square the result". The notation actually means "take the derivative, and then take the derivative of your result".

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