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Mathematics I20795 marksNumerical: partial derivativesPartial derivatives

Find the partial derivative fxx and fyy of f(x,y) = x2 + x3y2 - y2 + xy at (1,2).

Find the partial derivative $f_{xx}$ and $f_{yy}$ of $f(x,y) = x^2 + x^3y^2 - y^2 + xy$ at $(1,2)$. [5]

  • Function: $f(x,y) = x^2 + x^3y^2 - y^2 + xy$ - Evaluation point: $(x, y) = (1, 2)$ - Required: $f{xx}$ and $f{yy}$ at $(1,2)$ All data is present. --- Treat $y$ as constant: $$fx = 2x + 3x^2y^2 + y$$ $$f{xx} = \frac{\partial}{\partial x}\left(2x + 3x^2y^2 + y\right) = 2 + 6xy^2$$ Evaluate at
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