1. ## Partial derivatives problem

I used the limit definition of the partial derivative

f/x(a,b)=limh0f(a+h,b)f(a,b)/h.

but either x or y is 0 , and the whole equation equates to 0 at the end, resulting in the same result for either partial derivative.

Can anyone help me?

Thanks

2. ## Re: Partial derivatives problem

Welcome to MHF, mackygood!

As part of the process to find your partial derivative, you'll need to evaluate:

$\frac{\partial f}{\partial x}(0,y) = \lim_{h \to 0} \frac{f(h,y) - f(0,y)}{h}$

The first term in the nominator of this limit will not be zero...