Use spherical coordinate system to evaluate ${\displaystyle \underset{-2}{\overset{2}{}}}{\displaystyle \underset{-\sqrt[\phantom{2}]{4-x^2}}{\overset{0}{}}}{\displaystyle \underset{0}{\overset{\sqrt[\phantom{2}]{4-x^2-y^2}}{}}}{z}^2\sqrt[\phantom{2}]{x^2+y^2+z^2}dzdydx$