立方体对角线
The cube is diagonal
以上为机器翻译结果，长、整句建议使用 人工翻译 。
用矢量点积求立方体的两条对角线所夹的钝角。
Use the vector dot product to find the obtuse Angle between two diagonals of a cube.
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Use the vector dot product to find the obtuse angle between two diagonals of a cube .
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