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Let PQ be a focal chord of the parabola ...

Let PQ be a focal chord of the parabola `y^(2) = 4ax`. The tangents to the parabola at P and Q meet at a point lying on the line `y = 2x + a, a gt 0.`
If chord PQ subtends an angle `theta` at the vertex of `y^(2) = 4ax`, then `tantheta=`

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