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I have to derive that

The answer is supposed to be [4(x^2-1)(x^2+1)]/x^5 which is not what I get

sorry the answer is [4(x^2-1)(x^2+1)^3]/x^5

Can I use chain rule where there is a fraction?

Although we're done differentiating, we could still simplify:\[\frac{ 4(x^2+1)^3(x^2-1) }{ x^5 }\]

Ah ok

Thank you for your explanation

OHhhhh that's what I did before! I see my mistake now! :)

Thanks again!

yw!