Geometry

   

Triple Cosines Theorem

Authors: Yuly Shipilevsky

We prove that in Cartesian Coordinate System, the cosine of the angle between lines, belonging to two coordinate planes and both lines go through the origin with the corresponding angles to the same common axis is equal to multiplication of cosines of these angles.

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Submission history

[v1] 2019-09-01 08:30:19

Unique-IP document downloads: 70 times

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