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$\cos^2 \alpha + \cos^2 \beta + \cos^2 \gamma =2$
Author:
민은기 (Min Eun Gi)
Topic:
Angles
,
Cosine
,
Planes
GeoGebra
$\cos^2 \alpha + \cos^2 \beta + \cos^2 \gamma =2$
https://min7014.github.io/math20230327001.html
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