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∵ED||AB,DF||CA ∴∠BAD=∠EDA ∵CAD=∠FDA ∵AD是角CAB的角平分線 ∴∠BAD=∠CAD ∴∠EDA=∠FDA ∴AD是∠EDF的平分線 (如果AD和EF交於O,DO是∠EDF的平分線)
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