1) Find all relative extrema points and saddle points if any of the functionZ= 2x4 + y2 - x2 -2yShow work2) If f(x,y) = 9-x2-y2find : a) the gradient of f(1,2)b)the directional derivative of f(1,2) with the vector U=(cos π/3)i+(sinπ/3) j
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