Editor
Editor
 Sep 18, 2022
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If the focus lies on the y-axis with coordinates F(0,a) and directrix of the parabola is y=-a, then equation of parabola is:
Difficulty: Easy
A: 
$y^{2}=-4ax$
B: 
$x^{2}=4ay$
C: 
$x^{2}=-4ay$
D: 
$y^{2}=4ax$
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