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Area of the triangle formed by the three...

Area of the triangle formed by the threepoints `'t_1'. 't_2' and 't_3'` on `y^2=4ax` is `K|(t_1-t_2) (t_2-t_3)(t_3-t_1)|` then `K=`

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The correct Answer is:
`t_(1)+t_(2)+t_(3)`
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