Use spherical coordinates to find the limit. Let x = p sin o cos 0, y = ρ sin Ø sin θ, y = ρ sin Ø sin θ, and z = ρ cos Ø and note that (x, y, z) → (0, 0, 0) implies ρ → 0+.

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XYZ lim (x, y, z) (0, 0, 0) x² + y² + z²