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t 1 and  t 2 are two p...

t 1 and  t 2 are two points on the parabola `y^2 =4ax` . If the focal chord joining them coincides with the normal chord, then ` (a) t1(t1+t2)+2=0 (b)` t1+t2=0 ` (c)`` t1*t2=-1` (d) none of these     

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