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證明:∵AD平分∠BAC,DE⊥AB於E,DF⊥AC於F,∴DE=DF;∵DE⊥AB於E,DF⊥AC於F.∴在Rt△DBE和Rt△DCF中DE=DFDB=DC∴Rt△DBE≌Rt△DCF(HL);∴EB=FC.
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