http://img821.imageshack.us/img821/7901/heatp.png [Broken] Uploaded with ImageShack.us I'm having difficulty with the boundary conditions on this problem. I don't need a solution or a step by step. I've just never solved a boundary condition like this. Its the u(pi,t) = cos(t) that is giving me difficulty I tried getting a steady state solution for this. However, I end up with v(x) = (x/pi)*Cos(t) which makes no sense because v(x) should not be dependent on 't.' I can't make it homogeneous in order to solve it by separation of variables. Any advice would be greatly appreciated.