2008•宁夏)如图,在边长为4的正方形ABCD中,点P在AB上从A向B运动,连接DP交AC于点Q(1)试证明:无论点P运动到AB上何处时,都有△ADQ≌△ABQ;(2)当点P在AB上运动到什么位置时,△ADQ的面积是
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