A general solution of the PDE uux +yuy is of form y (a) f(u² - x², Y x+u (b) u ² = 8( x + u) y g = X = 0; where f: R² → R is C¹ and Vf ‡ (0,0) at anypoints + x² ; g = C(R) (c) f(u² + x²) = 0, f = C(R) (d) f(x + y) = 0, f = C(R)

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