Question: 13) Given the surface f (x, y, z) = 4- x2 + 3y? +- 7,point P(0,2, -1), and the vector D = (0, -.-) find

13) Given the surface f (x, y, z) = 4- x2 + 3y? +- 7,point P(0,2, -1), and the vector D = (0, -.-) find the directional derivative at point P in the direction of v

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