A unit radial vector `vecr` makes agles of `a=30^(@)` relative to the x-axis, ` `hatr` can :

A unit radial vector `vecr` makes agles of `a=30^(@)` relative to the x-axis, `beta=60^(@)` relative to the y-axis, and `gamma=90^(@)` relative to the z-axis. The vector `hatr` can be written as :