Question

Let f(x,y)=xcos(πy)−ysin(πx)f(x,y)=xcos⁡(πy)−ysin⁡(πx). Find the second-order Taylor approximation for ff at the point (1, 2).

Let f(x,y)=xcos(πy)−ysin(πx)f(x,y)=xcos⁡(πy)−ysin⁡(πx). Find the second-order Taylor approximation for ff at the point (1, 2).

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