As shown in the figure, in the rectangular coordinate system, the diameter of the semicircle is OC, the coordinate of the center D of the semicircle is (0,2), the quadrilateral OABC is a giant star, and the coordinate of point A is (6,0).

(1). If the tangent line passing through point P (2 √ 3,0) and tangent to point F of semicircle D intersects with Y axis and BC edge at point E respectively, find the analytical formula of the straight line where tangent line PF is located;

(2) If the tangents passing through point A and point B are semicircles respectively, and are at point P 1 and P2(P 1 point, P2 is not coincident with point O and point C), find the coordinates of point p 1 and P2 and explain the reasons.

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Y=-2/3√3X+4 process is difficult to write.

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