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Prove that the locus of the point of int...

Prove that the locus of the point of intersection of tangents to the parabola `y^2=4ax` which meet at an angle `alpha` is `(x+a)^2tan^2a=y^2-4ax`.

A

`(y^2-4ax)(x+a)^2=d^2x^2`

B

`(x^2-4ay)(x+a)^2=dx^2`

C

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

D

None of these

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The correct Answer is:
A
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