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Tangents are drawn from the origin to a ...

Tangents are drawn from the origin to a circle with centre at `(2,-1)`. If the equation of one of the tangents is `3x+y=0`, the equation of the other tangent is

A

1) `3x-y=0`

B

2) `x+3y=0`

C

3) `x-3y=0`

D

4) `x+2y=0`

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