Let be a variable point on the parabola
Then, the locus of the mid-point of the point
and the foot of the perpendicular drawn from the point
to the line
. Then the value of
is_______
3
2
1
0
Let be the mid point of the point
and the foot of the perpendicular drawn from
to the line
is the foot of perpendicular.
Now, put in
, we get
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