Prove that the locus of the point of intersection of \( \mathrm{P} ...

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Prove that the locus of the point of intersection of
\( \mathrm{P} \) tangents to the parabola \( y^{2}=4 a x \) which meet at an

W angle \( \alpha \) is:
\[
(x+a)^{2} \tan ^{2} \alpha=y^{2}-4 a x \text {. }
\]
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