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2. Suppose the temperature at the point (x, y) on the xy-plane is given the function T(x, y) = xy2+ yx2. Find the directional derivative

2. Suppose the temperature at the point (x, y) on the xy-plane is given the function T(x, y) = xy2+ yx2. Find the directional derivative of T at the point P(-1, 3) in the direction from P to the point Q (1, 1). [5 marks]

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