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- Find the tangent of the mathematical circle in the third grade.
Find the tangent of the mathematical circle in the third grade.
As shown in the figure, quadrilateral ABCD is inscribed in ⊙O, BD is the diameter of ⊙O, AE⊥CD, vertical foot is E, and DA bisects ∠ BDE.
It is proved that (1)AE is the tangent of ⊙O;
(2) If ∠ DBC = 30 and DE= 1cm, find the length of BD.
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