Question: Is there a direction u in which the rate of change of the temperature function T(x, y, z) = 2xy - yz (temperature in degrees

Is there a direction u in which the rate of change of the temperature function T(x, y, z) = 2xy - yz (temperature in degrees Celsius, distance in feet) at P(1, -1, 1) is -3°C/ft? Give reasons for your answer.

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