## Question

###### Calculate $frac{partial f}{partial x}, frac{partial f}{partial y},left.frac{partial f}{partial x}ight|_{(1,-1)}$, and $left.frac{partial f}{partial y}ight|_{(1,-1)}$ when defined. HINT [See Quick Examples page 1098.]$$f(x, y)=x^{4} y^{2}-x$$

Calculate $frac{partial f}{partial x}, frac{partial f}{partial y},left.frac{partial f}{partial x} ight|_{(1,-1)}$, and $left.frac{partial f}{partial y} ight|_{(1,-1)}$ when defined. HINT [See Quick Examples page 1098.] $$ f(x, y)=x^{4} y^{2}-x $$

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