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Show that x^(2) + y^(2) -6x -9y +13 =0, ...

Show that `x^(2) + y^(2) -6x -9y +13 =0, x^(2) +y^(2) -2x -16y =0` touch each other . Find the point of contact and the equation of common tangent at their point of contact.

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The correct Answer is:
`4x-3y+6=0`
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