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$\cos^2 \alpha +\cos^2 \beta+ \cos^2 \gamma =1$

Author:민은기 (Min Eun Gi)
Topic:Vectors 3D (Three-Dimensional), Angles, Cosine
$\cos^2 \alpha +\cos^2 \beta+ \cos^2 \gamma =1$ https://min7014.github.io/math20230402001.html

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