A student was asked to find the directional derivative off(x, y) = x2ey at the point (1
Chapter 14, Problem 55(choose chapter or problem)
A student was asked to find the directional derivative off(x, y) = x2ey at the point (1, 0) in the direction ofv = 4i + 3j . The students answer wasfu (1, 0) = grad f(1, 0) u = 85i +35j .(a) At a glance, how do you know this is wrong?(b) What is the correct answer?
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