at x 0, and z = A 3-D rectangular parallelepiped 0xa, 0 y b, 0 z c is initially at temperature F(x, y, z). For times > 0. the boundaries 0 are insulated, and the boundaries at x = a, y b, and z = c all dissipate heat by convection into an environment with fluid temperature T and with identical heat transfer coefficients hat all three boundaries. Obtain an expression for the temperature distribution 7(x, y, z, t) in the region. = = = 0, y