已知:如图,在△ABC中,∠C=90°,点D、P分别在边AC、AB上,且BD=AD,PE⊥BD,PF⊥AD,垂足分别为点E、F.(1)当∠A=30°时,求证:PE+PF=BC(2)当∠A≠30°(∠A<∠ABC)时,试问以上结论是否依然正确?如

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