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P가 A오른편에 존재할때는 각 BPA = 각 BPD 임을 이용해서
삼각형 APB BPD APE PCD에서의 사인법칙
결과를 연립하면 체바정리에의해 DEF가 일직서상임이 증명됩니다!

- dc official App