如图,已知AB⊥BC,AB=BC=
a,a∈[1,3],圆A是以A为圆心、半径为2的圆,圆B是以B为圆心、半径为1的圆,设点E、F分别为圆A、圆B上的动点,
∥
(且
与
同向),设∠BAE=θ(θ∈[0,π]).
(I)当a= ,且θ=
时,求
的值;
(Ⅱ)用a,θ表示出,并给出一组a,θ的值,使得
最小.
更新时间:2018-02-13 17:02:53
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