请讲解这道题。---【2025浙江中考数学T24】已知菱形ABCD, AB=5, AC=8 (1)求sin∠CAB的值. (2)E是AD延长线上一点, 将△EAB沿EB翻折到△EFB. 延长AC交EF于点P, 连接BP ①若AP⊥EF, 求AE的长; ②求PA-PB的最小值. Chart/Diagram Description: * Type: Geometric figure. * Main Elements: * Points: Labeled points A, B, C, D, E, F, P are shown. * Lines/Segments: Lines or segments connecting these points are depicted, including AB, BC, CD, AD, AC, BD (diagonal suggested by points B and D), AE (extension of AD), EB, EF, FB, AC extended, EF, AP, CP, EP, FP, BP. * Shapes: A rhombus ABCD is suggested by the points and lines. Triangles EAB and EFB are shown, sharing the side EB. * Labels: Points are labeled A, B, C, D, E, F, P. * Relative Position and Direction: Point E is shown on the line extending from A through D. Point P is shown at the intersection of the extended line AC and the line EF. Line segment BP is drawn. * Other relevant text in diagram: 小红书号: 277487790