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Mathematics
Mathematics
Problem
For the parabola
x
2
=
16
y
x^{2}=16y
x
2
=
16
y
, the equation of its directrix is a)
y
=
4
y=4
y
=
4
b)
x
=
4
x=4
x
=
4
c)
y
=
−
4
y=-4
y
=
−
4
d)
y
=
−
16
y=-16
y
=
−
16
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