Struggling with the 2nd Derivative of f(x)=x/x^2+1?

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The discussion centers on finding the second derivative of the function f(x) = x/(x^2 + 1). The first derivative is correctly calculated as f'(x) = (1 - x^2)/(x^2 + 1)^2. However, the user struggles with the second derivative, initially arriving at -4x^5 - 2x^3 - 2x/(x^2 + 1)^4, which is incorrect. The conversation emphasizes the importance of correctly applying the chain rule during differentiation.

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ande1717
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f(x)=x/x^2+1
f'(x)= 1-x^2/(x^2+1)^2
But then I can't seem to work through taking the 2nd derivative, perhaps I am not using the chain rule right.
I get -4x^5-2x^3-2x/(x^2+1)^4
But that's not right... please help!
 
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You double-posted, probably by accident. But let's stay in one thread.
 

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