Question: Use polar coordinates to find the limit. Let x = r cos and y = r sin , and note that (x,y) (0,

Use polar coordinates to find the limit. Let x = r cos θ and y = r sin θ, and note that (x,y) → (0, 0) implies r → 0.

x3 x + y lim (x, y) (0,0) x + y 

x3 x + y lim (x, y) (0,0) x + y

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