Find the derivative of the function

f(x)= 1/(sqrt (2x^3)-9)

In google type: calc101

When you see list of resultc click on:

Calc101com Automatic Calculus,Linear Algebra and Polynomiasls
When page be open clik option: derivatives

When this page be open in rectacangle type:

1/sqrt[(2x^3)-9]

and click options DO IT

You will see solution step-by-step

By the way on this site you can practice any kind of derivation.