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The circles x^2 +y^2=9 and x^2 +y^2-2y+2...

The circles `x^2 +y^2=9` and `x^2 +y^2-2y+27=0` touch each other. The equation of their common tangent is

A

`4y=9`

B

`y=3`

C

`y=-3`

D

`y=2`

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