Can someone help please:

The steady-state temperature distribution u = u(x, y) of a rectangular slab occupying the region 0 0 O Trivial solution, F(x) = 0 OFn(x) = An cosh (nix ), n = 1, 2, 3... OF(x) = A a constant. OFn(x) = An sinh nux "[" ) , n = 1 , 2 , 3 .. . OFn(x) = An cos ( nTI ) + By sin nix L , n = 1,2, 3