| Let D denote the unit disc given by {(x,y) x² + y² ≤1} and let De be its complement in the plane. The partial differential equation (x²-1) 0²4 +2y ²u axay (b) (c) (d) อน ay² = 0 is (a) Parabolic for all (x, y) = D Hyperbolic for all (x,y) = D Hyperbolic for all (x, y) = DC Parabolic for all (x,y) e D

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