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The equation of the common tangent touch...

The equation of the common tangent touching the circle `(x-3)^2+y^2=9` and the parabola `y^2=4x` above the x-axis is `sqrt(3)y=3x+1` (b) `sqrt(3)y=-(x+3)` (C)`sqrt(3)y=x+3` (d) `sqrt(3)y=-(3x-1)`

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