Well, last time I did an easy limit and got answers within a few minutes so we are moving on from those. Lets try some simple derivatives.

Given:

find the value of the mixed partial derivative:

or for those of you unfamiliar with that notation:

As before, the first correct answer gets the pass. I would say no guessing but you can't really guess with this one and if you somehow guessed the right answer I would give it to you for sure. I will accept answers fully typed out, but if you can type it up neat like I do then please do, it is nicer to look at.