Find the directional derivative of the function at P in the direction of f(x, y, z) = xy + yz + xz, P(3, 4, –3), v = 6i + j – k

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A: We can solve this as follows:

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Q: f (x) = x² – 2x ; a = 1 f (x) = |x| ; a = 0 f (x) = ; a = 0 3 x+1 f (x) = ; a = 3

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