Comprehension \( P \) is variable point on the line \( L=0 \). Tangents are drawn to the circle ...

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Comprehension
\( P \) is variable point on the line
\( L=0 \). Tangents are drawn to the circle \( x^{2}+y^{2}=4 \) from \( P \) to touch \( Q \) and \( R \). The parallelogram \( P Q S R \) is completed. .

If \( L \equiv 2 x+y=6 \), then the locus of circumcentre of \( \triangle P Q R \) is
(a) \( 2 x-y=4 \)
(b) \( y+2 x=3 \)
(c) \( x-2 y=4 \)
(d) \( x+2 y=3 \)
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