mathcalc
posted by shakira .
find third derivate f(x)=x/x+1

As typed, without parenthesis
f(x) = x/x + 1
f' = 0 
In google type: calc101
When you see list of resultc click on:
Calc101com Automatic Calculus and Algebra Help
When page be open clik option: derivatives
When this page be open in rectacangle type:
x/(x+1)
and click options DO IT
You will see solution stepbystep
By the way on this site you can practice any kind of derivation.
P.S.
Third derivate is derivate of second derivate.