H.W: 1. find the derivative of the function f(x, y, z) = xy + yz + zx ,at the point P,(1,-1,2) in the direction of A = 3i +6j– 2k 2. find the derivative of the function g(x, y,z) = 3e* cos yz ,at the point P,(0,0,0) in the direction of A = 2i + j– 2k

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