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In other words, that chord is not the focal chord? Thank you guys!

J&C Book 2 Exercise 23.2 Q1 a) : Find the equation of the chord joining: t1 = 2, t2 = -1 on x=2t, y=t^2. Show that this chord passes through the focus. I got to the equation of the chord (x-2y+4=0), but the focus part! from the set of parametric equations, t= x/2. substituting t...