In the parabola \( y^{2}=4 a x \), the length of the chord \( \math...

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In the parabola \( y^{2}=4 a x \), the length of the chord
\( \mathrm{P} \) through the vertex and inclined to the axis at \( \pi / 4 \), is:

W
(1) \( 4 \sqrt{2} a \)
(2) \( 2 \sqrt{2} a \)
(3) \( \sqrt{2} a \)
(4) None of these
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