Given that circle \( x^{2}+y^{2}-2 x+6 y+6=0 \) and \( \mathrm{P} \...

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Given that circle \( x^{2}+y^{2}-2 x+6 y+6=0 \) and
\( \mathrm{P} \) \( x^{2}+y^{2}-5 x+6 y+15=0 \) touch, the equation to

W their common tangent is
(1) \( x=3 \)
(2) \( y=6 \)
(3) \( 7 x-12 y-21=0 \)
(4) \( 7 x+12 y+21=0 \)
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