If the normals to the parabola \( y^{2}=4 a x \) at three
P points ...
If the normals to the parabola \( y^{2}=4 a x \) at three
P points \( P, Q \) and \( R \) meet at \( A \) and \( S \) be the focus, prove
W that \( S P \cdot S Q \cdot S R=a(S A)^{2} \).
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