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The function \( f(x, y)=2 x y \) has an absolute maximum value and absolute minimum value subject ...
The function \( f(x, y)=2 x y \) has an absolute maximum value and absolute minimum value subject to the constraint \( x^{2}+y^{2}-x y=9 \). Find the gradient of \( f(x, y)=2 x y \). \[ \nabla f(x, y)=\langle\square, \square \]