Hey.

I need to find maximum and minimum for this function, as you can see, I found (0,0) as a "suspicious point" (I don't know how it's called in English ).

My question is, how can I determine if it's Max or Min (if it's possible)?

I know the test of the second derivative, but how should I get it? I mean should I use the definition of the derivative because I think there is a problem around the point (0,0).

Any idea guys?