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For z=x2-xy2 find: a. the gradient of Z b. the directional derivative in direction of <3,1>...

For z=x2-xy2 find:

a. the gradient of Z

b. the directional derivative in direction of <3,1>

c. the approximation for Δ? when taking a Δs =0.05 step from (1,2) in direction of <3,-1>

d. the approximation to the maximum Δ? possible when taking a Δs =0.05 step from (1,2).

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