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Find the answer to the 20 10 national college entrance examination math (science) 2 1 question.
(2 1) (The full mark of this small question is 12) (Note: the answer on the test paper is invalid)

Known parabola c? y^2? The focus of =4x is f, the straight lines L and C(- 1, 0) passing through point K intersect at points A and B, and the symmetry point of point A about the X axis is d. 。

(i) prove that the point f is on the straight line BD;

(2) Settings? =? The equation for finding the inscribed circle m of △BDK.