SOLUTION: Let {{{f(x)=1/x^2}}}. How do I show (just using the definition of the derivation, which is the difference quotient), that f is differentiable in R\{0} and that f'(x)={{{-

Question 1005498: Let
.
How do I show (just using the definition of the derivation, which is the difference quotient), that f is differentiable in R\{0} and that
f'(x)=
for x as an element of R?
Thanks for your help!
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!

So now taking the limit as h goes to zero,

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