Find (:x:),(:p:),(:x^(2):) expectation values for the
nth state of the one dimensional harmonic
oscillator by using the ladder operators hat(a) and hat(a).
hat(x)=\sqrt((?)/(2m\omega ))(hat(a)+hat(a)†),hat(P)=i\sqrt((m?\omega )/(2))(hat(a)^(†)-(hat(a)))