  We calculate the Wigner distribution function for the Calogero-Sutherland
system which consists of harmonic and inverse-square interactions. The Wigner
distribution function is separated out into two parts corresponding to the
relative and center-of-mass motions. A general expression for the relative
Wigner function is obtained in terms of the Laguerre polynomials by introducing
a new identity between Hermite and Laguerre polynomials.
