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已知△ABC中,AB=AC,EF交AB于E,交AC的延长线于F,且BE=CF.求证：DE=DF
已知△ABC中,AB=AC,EF交AB于E,交AC的延长线于F,且BE=CF.求证：DE=DF
已知△ABC中,AB=AC,EF交AB于E,交AC的延长线于F,且BE=CF.求证：DE=DF
已知△ABC中,AB=AC,EF交AB于E,交AC的延长线于F,且BE=CF.求证：DE=DF