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First consider the points on the parabola where the chord intersects in the parametric form as (at1^2 , 2at1) and (at2^2 , 2at2). As it is a focal chord, t1* t2 = -1. Let this be our first equation. Now consider the equation of chord as we know two points. Now using the formula for the distance of a point from a line ( In this case the point is the origin and the line is the chord)we can get a relation between t1 , t2 , and p. Let this be our second equation. Using these both equations we can get the points which we assumed before in terms of p and then use the distance formula to find the length of the chord. This is how u solve this problem.
Its better to revise your basics on parabolas and even the previous topics as much as possible and know how to use them so that co- ordinate geometry wouldn''t be a big problem.
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