Then e is the largest when it is the vertex of the parabola.
Vertex (3/2, 25/4) is found by vertex.
(3/2) Substitute into a straight line to get P(3/2, -5/2).
then
(! Let CQ be perpendicular to the y axis.
Q(0,-4)
The focus of parabola on the Y axis is exactly (0,4).
So q passes through a parabola, so we can know that q is symmetrical about the straight line PE in C, and PQ=PC.
Easy-to-get PC=3 root numbers 2/2
QC=3
In proportion, it is an isosceles right triangle right angle.
(! ! Therefore, it is easy to know that there is no other situation in the triangle with PC as the right angle.
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