立体几何余弦定理 cosine theorem in space
余几
Residue several
以上为机器翻译结果，长、整句建议使用 人工翻译 。
余大笑，几不能立，曰：“忆余昔不以为然否？”
I laughed out loud and could hardly keep standing: "Didn't you remember my disagreement?"
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