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如图在△ABC中∠C=90°AC=BC=4点D为边AC的中点点E为AB上一动点连接DE。将线段DE绕点E顺时针旋转45°得到线段EF。
(1) 求线段AB的长
(2) 当EF∥AC时求AE的长
(3) 当点F在边BC上时求证△ADE≌△BEF
(4) 当点E到BC的距离是点F到BC距离的2倍时直接写出AE的长。