84) The locus of poles of normal chords of the parabola y2 = 4ax is
1) (x + 2a) y2 = 4a3       2) (x + 2a) y2 + 4a3 = 0     3) (x – 2a) y2 = 4a3     4) (x – 2a) y2 + 4a3 = 0

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