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## Main Question or Discussion Point

Can't seem to work this out,

any solutions would be greatly appreciated!

Thanks in advance!

Solve the boundary-value problem

Uxx + Uyy + U = 0 , 0<x<1,0<y<1

U(0,y) = 0 , Ux(a,y)= f(y)

U(x,0) = 0 , Uy(x,1)= sin(3*pi*x)

any solutions would be greatly appreciated!

Thanks in advance!

Solve the boundary-value problem

Uxx + Uyy + U = 0 , 0<x<1,0<y<1

U(0,y) = 0 , Ux(a,y)= f(y)

U(x,0) = 0 , Uy(x,1)= sin(3*pi*x)