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#### Guest

##### Guest

f(x)=1/x^2 -1

I am not getting the right answer and not sure where I am messing up.

f'(x)=(x^2-1)(1)-1(2x)/ (x^2-1)^2

=x^2-1-2x/(x^2-1)^2

f''=(x^2-1)(-2)(-2x)

I am having trouble with the second derivative.

Thank for any help you may give.

Amy