Incorrect derivative

[richardbullin]

Hello!

Just reporting an error with derivative.

Using the demo on your website returns the below:

The first part of the answer should be "3(x^0.5+x)^2" or equivalent? If you substitute x=4 into the result you should get 135 not 75.9

Cheers
Richard

[jiggzson]

@richbully, got it. Thanks.