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![[Post New]](/templates/default/images/icon_minipost_new.gif) 2 Dec 2007 23:01:38 IST
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eqn of chord whose mid point is (h, k) is
ky-2a(x+h) = k^2-4ah
now eqn of normal at point (at^2, 2at) is
y+tx=2at+at^3
compare the coeff of x and y and eliminate t to get the locus
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