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Prove that the area of the triangle form...

Prove that the area of the triangle formed by the tangents at `(x_(1),y_(1)),(x_(2)) "and" (x_(3),y_(3))` to the parabola `y^(2)=4ax(agt0)` is
`(1)/(16a)|(y_(1)-y_(2))(y_(2)-y_(3))(y_(3)-y_(1))|` sq.units.

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