\( P S Q \) is a focal chord of a parabola whose focus is \( S \) \...

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\( P S Q \) is a focal chord of a parabola whose focus is \( S \)
\( \mathrm{P} \) and vertex is \( A . P A \) and \( Q A \) are produced to meet

W the directrix in \( R \) and \( T \), respectively. Then \( \angle R S T= \)
(1) \( 30^{\circ} \)
(2) \( 90^{\circ} \)
(3) \( 60^{\circ} \)
(4) \( 45^{\circ} \)
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