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'o' Is the vertex of the parabola y^(2)=...

'o' Is the vertex of the parabola `y^(2)=8x&L` is the upper end of the latus rectum.If `LH` is drawn perpendicular to `OL` meeting `x`axis in `H`,then the length of the double ordinate through `H` is `lambda sqrt(5)` where 'lambda =

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