Question: Use the level curves of the function z = f(x, y) to decide the sign (positive,negative, or zero) of each of the partial derivatives at
Use the level curves of the function z = f(x, y) to decide the sign (positive,negative, or zero) of each of the partial derivatives at the point P. Assume the x-and y-axes are in the usual positions.321fx(P) isfy(P) isfxx(P) isfyy(P) isfxy(P) is?????
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