Use polar coordinates to find the limit. [If (r, θ) are polar coordinates of the point (x, y) with r ≥ 0, note that r → 0+ as (x, y) → (0, 0).] (If an answer does not exist, enter DNE. Do this on paper. Your instructor may ask you to turn in this work.) lim_(\(x text(,) y\) -> \(0 text(,) 0\)) (x^6 + y^3)/(x^2 + y^2)