The tangent at any point P onthe parabol...

The tangent at any point `P` onthe parabola `y^2=4a x` intersects the y-axis at `Qdot` Then tangent to the circumcircle of triangle `P Q S(S` is the focus) at `Q` is a line parallel to x-axis y-axis a line parallel to y-axis (d) none of these

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