# Please answer fully and clearly. Thank you. )if (e-) (0.0)) if (z, y)#10, 0), 2. Consider f R2R defined by f(,) plHP, 0, if (x,y) (0,0)J (a) Show by explicit computation that the directional derivati...

)if (e-) (0.0)) if (z, y)#10, 0), 2. Consider f R2R defined by f(,) plHP, 0, if (x,y) (0,0)J (a) Show by explicit computation that the directional derivative exists at (x, y) - (0,0) for all di rections u R2 with lull-1, but that its value (0,0)メ(Vf(0,0), u), for at least one such u. b) Show that the partial derivatives of f are not continuous at (0,0)

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