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Through the vertex \( O \) of the parabola, \( y^{2}=4 a x \) two chords \( O P \) and \( O Q \) are drawn and the circles on \( O P \) and \( O Q \) as diameters intersect in \( R \). If \( \theta_{1}, \theta_{2} \) and \( \phi \) are the angles made with the
P axis by the tangents at \( P \) and \( Q \) on the parabola and by \( O R \), then the value of, \( \cot \theta_{1}+\cot \theta_{2} \) is

W equal to:
(a) \( -2 \tan \phi \)
(b) \( -2 \tan (\pi-\phi) \)
(c) 0
(d) \( 2 \cot \phi \)
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