(G). Find the direction derivative of f(x, y) = In(x2 + y2) at the point (1,2) in the direction u =
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阿摩線上測驗
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阿摩線上測驗
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(G). Find the direction derivative of f(x, y) = In(x2 + y2) at the point (1,2) in the direction u =.