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[几何] 三角函数等式问题

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星奔川骛 Posted 2025-4-13 17:25 |Read mode
在△ABC中,已知cosA=cosy*sinz,cosB=cosz*sinx,cosC=cosx*siny
证明:tanx*tany*tanz =1.

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kuing Posted 2025-4-13 18:16

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hbghlyj Posted 2025-4-13 21:25
建议楼主看一看置顶公式输入,更方便交流。只是建议。

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