The second-order differential equation in an unknown function u / u * (x, y) is defined as partial^ 2 u partial x ^ 2 =2 Assuming g: g(x), f / f * (y) h: h(y) the general solution of the above differential equation
(a) u = x ^ 2 + f(y) + g(x)
(b) u = x ^ 2 + xf(y) + g(x)
(c) u = x ^ 2 + xf(y) + h(y)
d)j x^ +f() y(x
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