If the Hamiltonian operator of a system is  = a d^2/dx^2 and the eigenfunction of one of its states is:  = b cos[(/L)x] where a, b, and L(length of box) are constants, then the energy of this system is __________. If this function describes a one-dimensional box in x of length L, at what values of x would the limits of the boundary conditions for this box. If b is the normalization constant, determine its value.