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Find the equations to the common tangent...

Find the equations to the common tangents of the circles `x^2+y^2-2x-6y+9=0` and `x^2+y^2+6x-2y+1=0`

A

`x=0`

B

`y =4`

C

`3x + 4y =10`

D

all of these

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The correct Answer is:
D
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