(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Determine the second derivative for the following function:

y= (x^2-4)/(x+1)

2. Relevant equations

3. The attempt at a solution

Well, the first derivative is (x^2+2x+4)/(x^2+2x+1)

For calculating the second derivative I can only get as far as (-6x-6)/(x^4+4x^3+6x^2+4x+1)

On an online derivative calculator, the answer is : -(6/(x^3+3x^2+3x+1)) , yet I can't get to it :(

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# 2nd derivatives

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