Find the derivative of f(x) =2x^2-1/x^2 in three ways :
(a) using the quotient rule
(b) using the product rule
(c) using neither the product rule nor the quotient rule
I have already done all of these out.
my answers:
a) 2/x^3
b)-4x^3+x+8/2
c)2
for each one I've gotten a different answer, just wondering why. I think I'm supposed to get the same answer each time.

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is it:\[\frac{2x^2-1}{x^2}\]?

yes it is.

Messed up in product rule somewhere.

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