Find the first partial derivative "\\displaystyle{\\frac{\\partial z}{ \\partial x}}" of the function "z=x^2e^{-y}" at point (2,-1)
"\\frac{\\partial z}{\\partial x}=2xe^{-y}"
"\\frac{\\partial z}{\\partial x}|_{(2,-1)}=2\\cdot2e^{-1}=4\/e"
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