  We study the ground-state properties of dilute Bose gas confined to both
isotropic and anisotropic traps to assess the accuracy of Gross-Pitaevskii (GP)
theory. To go beyond GP approximation we use Huang-Yang theory of interatomic
interaction energy for hard-sphere Bose gas and use a variational method to
solve the resulting modified GP equation. We also make an analytic estimate of
the corrections due to higher-order terms in the interatomic interaction
energy. We find that the corrections are of the order of 1 percent. However,
there is a qualitative change in the density profile due to presence of
logarithimic term in the interaction energy for large N (number of atoms)
