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The ,locus of the point of intersection ...

The ,locus of the point of intersection of two perpendicular tangents to the parabola `y^(2)=4ax` is

A

`x^2 + y^2 = a^2`

B

`ay^2 = x`

C

`x+a = 0 `

D

`x+ y pm a =0`

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The correct Answer is:
C
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