MathGroup Archive 1999

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Linear algebra


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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