Let f : R2_> R be defined by: 1 f (20) = (2 1+ 2 2+ 1)2 (a Find the directional derivative at x0 =
Let f : R2_> R be defined by: 1 f (20) = (2 1+ 2 2+ 1)2" (a Find the directional derivative at x0 = (0, 0) in direction v = (1, 1) . (b) Find the best quadratic approximation of the function at x0 = (0,0)
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