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11. Find the solution of the following Cauchy problems: (a) xp + yq = xy, u(x, y) =x on y = x. (b) -xp+

11. Find the solution of the following Cauchy problems: (a) xp + yq = xy, u(x, y) =x on y = x. (b) -xp+ yq = a, (0 < x < y), u= 2x on y=3x, where a is a constant. (e) (p +g)x = pu, u(0,s2) = 2s %3D +q

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