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[" 8.If the segment intercepted by the p...

[" 8.If the segment intercepted by the parabola "y=4ax" with the "],[" line "lx+my+n=0" subtends a right angle at the vertex,"],[" then "],[[" a."4al+n=0," b."4al+4am+n=0],[" c."4am+n=0," d."al+n=0]]

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Prove that a double ordinate of the parabola y^2=4ax of length 8a subtends a right angle at its vertex.