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The rate of change in a given direction Find the rate of change of the function f(x, y) = va + yz at the point

The rate of change in a given direction Find the rate of change of the function f(x, y) = va + yz at the point (-2, 2) and in the direction of the vector (2, -1), and also find a point at which the rate of change doesn't exist. D(2, 1) f(-2, 2) = _ f is NOT differentiable at the point (

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