Posted by Abigail on .
Let f(x)= (1/x). Use the limit definition of derivative to find f'(x).
My professor's answer is: 1/x
but I keep getting: 1/x^2
what do I have to do to get that answer?

Calculus 
MathMate,
See response at:
http://www.jiskha.com/display.cgi?id=1298852048