Solve the steady-state temperature distribution which satisfies Laplace's equation +=0 by Liebmann's iteration method (until fourth iteration) satisfying the following boundary conditions: u(0, y) =0 0 y 3 u(3,y) =12+y, 0y 3 u(x,0)=x(x+1), 0x3 u(x,3)= 5x, 0 x3