Linear algebra

*To*: mathgroup at smc.vnet.net*Subject*: [mg15876] Linear algebra*From*: Roland Bengtsson <d98rolb at stud.hh.se>*Date*: Wed, 17 Feb 1999 23:33:32 -0500*Organization*: Lund Institute of Technology, Sweden*Sender*: owner-wri-mathgroup at wolfram.com

Let V1, V2, V3 and V4 be the angles that a given line create with the diagonals in space in a cube. How can I calc the sum of: (cos V1)^2 + (cos V2)^2 + (cos V3)^2 + (cos V4)^2 in Mathematica 3.0 or by hand? All help appreciated!