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For the parabola y^2=4p x find the extre...

For the parabola `y^2=4p x` find the extremities of a double ordinate of length `8pdot` Prove that the lines from the vertex to its extremities are at right angles.

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Let `PQ` be the double ordinate of length `8p` of the parabola `y ^2 = 4 p x`
`PR=QR=4p` ...
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