If \( (a, b) \) is the mid-point of chord passing through \( \mathr...

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If \( (a, b) \) is the mid-point of chord passing through
\( \mathrm{P} \) the vertex of the parabola \( y^{2}=4 x \), then:

W
(1) \( a=2 b \)
(2) \( 2 a=b \)
(3) \( a^{2}=2 b \)
(4) \( 2 a=b^{2} \)
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