[Solved] I am performing the second derivative tes

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I am performing the second derivative test on the following function: y 2 - x 3 -y 3 +2xy I have found the first and

I am performing the second derivative test on the following function: y² - x³-y³+2xy

I have found the first and second partial derivatives. That's not the problem.

How do I find f_xy(the value 'I need to find the discriminant? I need a step by step with explanations please. I know it is two, but am not sure why I know that.

Thank you.

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