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If the equation of one tangent to the ci...

If the equation of one tangent to the circle with centre at (2, -1) from the origin is `3x+ y= 0`, then the equation of the other tangent through the origin is

A

`3x- y= 0`

B

`x+ 3y= 0`

C

`x- 3y= 0`

D

`x+ 2y=0`

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