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The tangents to the parabola y^2=4ax at ...

The tangents to the parabola `y^2=4ax` at `P(at_1^2,2at_1)`, and `Q(at_2^2,2at_2)`, intersect at R. Prove that the area of the triangle PQR is `1/2a^2(t_1-t_2)^3`

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The correct Answer is:
`1/2a^2|(t_1-t_2)|^3`
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