21.已知曲线C:y=
,D为直线y=
上的动点,过D作C的两条切线,切点分别为A,(B)
(1)证明:直线AB过定点:
(2)若以E(0,
)为圆心的圆与直线AB相切,且切点为线段AB的中点,求四边形ADBE的面积.
正确答案
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