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A pair of tangents are drawn from a poin...

A pair of tangents are drawn from a point P to the circle `x^2+y^2=1`. If the tangents make an intercept of 2 on the line x=1 then the locus of P is

A

`y^2=2(x+1)`

B

`2y^2=-(x+1)`

C

`y^2=2(x-1)`

D

`y^2=-2x+1`

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The correct Answer is:
A
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