Write the expectation value of the Hamiltonian as a constant times .Use the Fact that and then __ for n odd and for n E En = Eln2 GEE\" = _ can = 0 even. Use as well the result : l 1 l l 1 31:2 1+_+_+_+_+_+ : 32 52 72 92 ll2 8 , 96131 1 1 1 96E1n2 Answer H = 1+_+_+_+. = _=1.216 E 7:4( 32 52 72 ) n4 8 ' 1 2 V(x)=_kx 2