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MathGroup Archive 1999

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Linear algebra

  • To: mathgroup at
  • Subject: [mg15876] Linear algebra
  • From: Roland Bengtsson <d98rolb at>
  • Date: Wed, 17 Feb 1999 23:33:32 -0500
  • Organization: Lund Institute of Technology, Sweden
  • Sender: owner-wri-mathgroup at

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!

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