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How to do this math problem for senior high school entrance examination in Jiaxing Nanhu District 20 12 test paper.
(1) Let the function expression of parabola be, and substitute it into point C (0, -3), then the function expression of parabola is.

(2) By knowing A (- 1, 0) and B (3,0), let the functional expression of BC line be, and substitute it into point B (3,0) and point C (0,3) to get the solution. So the functional expression of BC line is.

(3)① Since AB = 4, since P and Q are symmetrical about the straight line X = 1, the abscissa of point P is. In this way, the coordinates of point p and point f are obtained.

In addition, the coordinates of point e are.

Line BC: The coordinate of the intersection of D and parabola symmetry axis X = 1 is (1, -2).

The intersection d is DH⊥y axis, and the vertical foot is H.

In Rt△EDH, DH = 1, so tan ∠ ced.

② , .