3-8 Obtain an expression for the steady-state temperature distribution T(x, y, z) in a 3-D rectangular parallelepiped 0 x a, 0 y b, 0 Z c for the following boundary conditions: The boundary surface at x = 0 is kept at temperature To, the boundaries at y = 0 and z = 0 are kept insulated, the boundary at x = a is kept at zero temperature, and the boundaries at y = b and z = c dissipate heat by convection into an environment at zero temperature. The heat transfer coefficients h are the same for the two convective surfaces.