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If y1, y2, y3 be the ordinates of a vert...

If `y_1, y_2, y_3` be the ordinates of a vertices of the triangle inscribed in a parabola `y^3=4a x ,` then show that the area of the triangle is `1/(8a)|(y_1-y_2)(y_2-y_3)(y_3-y_1)|dot`

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