When f(x,y_=x^3+y^2-6xy+9x+5y+2, find d(x,y) as used in the second derivative test.

When f(x,y_=x^3+y^2-6xy+9x+5y+2, find d(x,y) as used in the second derivative test.

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*f(x,y)

Your first step is to find derivative x and treat y as a constant

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