Mathematics Parabola, Ellipse and Hyperbola Parabola

If chord PQ subtends an angle θ at the vertex of y² = 4ax, then cot(θ) = ?

1
\(-\frac{3}{ 2√5 }\)
2
\(-\frac{5}{ 2√5 }\)
3
\(\frac{5}{ 2√5}\)
4
\(\frac{7}{2√5 }\)

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