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Multivariable & Vectoreasy
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If a surface is defined by z=f(x,y)z = f(x,y)z=f(x,y) and we know that ∂f∂y(1,2)<0\frac{\partial f}{\partial y}(1,2) < 0∂y∂f​(1,2)<0, which of the following statements is true?