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If two tangents drawn from a point P to the parabola y2 = 4x are at right angles, then the locus of P is (1) `2x""+""1""=""0` (2) `x""=""1` (3) `2x""""1""=""0` (4) `x""=""1`

A

`x= -1`

B

`2x-1=0`

C

`x=1`

D

`2x+1=0`

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The correct Answer is:
A
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