hi, i have a test on derivatives tomorrow and was going over some problems when I got stumped. I have the problem and the answer, but i want to know how to get the answer. thanks

use definition fprime (a) = (lim as h approaches 0) [f(a+h) - f(a)] / h

to find the derivative of the given function at the indicated point

f(x) = 1/x, a = 2

nvm, brain cramp, i figured it out