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The normal to the parabola y^(2)=4ax at ...

The normal to the parabola `y^(2)=4ax` at `P(am_(1)^(2),2am_(1))` intersects it again at `Q(am_(2)^(2), 2am_(2))`.If A be the vertex of the parabola then show that the area of the triangle
APQ is `(2a^(2))/(m_(1))(1+m_(1)^(2))(2+m_(1)^(2))`.

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