Mathematics
Senior High
Solved
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|1辺の長さが2の正四面体 ABCD がある。辺 BCの中点を M,
ZAMD=0とし,頂点 Aから MD に下ろした垂線を AN とする.
1
cosO =
2
3
AN=-
4
5
6
BN =
7
8
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