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Mathematics
Problem
Explain, in one or two sentences, why if
(
x
,
y
)
(x,y)
(
x
,
y
)
lies on the parabola
y
2
=
4
a
x
y^{2}=4ax
y
2
=
4
a
x
, then
(
x
,
−
y
)
(x,-y)
(
x
,
−
y
)
also lies on the same parabola.
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