The equations of the directrix of the parabola with vertex at the o...

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The equations of the directrix of the parabola with vertex at the origin and having the axis along the \( x \)-axis and a
P common tangent of slope 2 with the circle \( x^{2}+y^{2}=5 \) is

W (are)
(1) \( x=10 \)
(2) \( x=20 \)
(3) \( x=-10 \)
(4) \( x=-20 \)
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