题目如图,ADADAD平分∠BAC\angle BAC∠BAC,∠EAD=∠EDA\angle EAD=\angle EDA∠EAD=∠EDA.(1)(1)(1)求证:∠EAC=∠B\angle EAC=\angle B∠EAC=∠B；(2)(2)(2)若∠B=60∘\angle B=60^{\circ}∠B=60∘,∠CAD:∠E=1:4\angle CAD:\angle E=1:4∠CAD:∠E=1:4,求∠E\angle E∠E的度数.知识点：平行线的判定章节：图形的性质 / 相交线与平行线
如图,平分,.如图,平分,.如图,平分,.