3.如圖,△ABC和△ADE中,∠BAC=∠DAE=90°.
(1)如圖1,若AB=AC,AD=AE.點(diǎn)A、B、D共線時(shí),∠DCA=35°,求∠CBE的度數(shù).
(2)如圖2,AB=AE,AC=AD,且點(diǎn)A、B、D不共線時(shí),點(diǎn)H為線段BD的中點(diǎn),判斷AH與CE的數(shù)量關(guān)系,并證明.
(3)如圖3,若AB=AC,AD=AE.點(diǎn)A、B、D不共線時(shí),點(diǎn)G為CD的中點(diǎn),△ADE繞點(diǎn)A旋轉(zhuǎn)過程中,連接BG,若
,
,直接寫出線段BG的最大值.