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[几何] 锥线 角互补

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1+1=? posted 2025-6-18 23:00 from mobile |Read mode
这可能是熟知结论
有心锥线的两个焦点分别是$A,B$,从$A$的极线上一点作锥线的两条切线,切点是$C,D$,两切线的夹角设为$α$,二直线$BC,BD$的夹角设为$β$,则有$2α+β=180⁰$.
1+1=2吗?

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