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.