Can every chord on a parabola be chord of contact??
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Can every chord on a parabola be chord of contact??
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Answer:
In other words you are asking is it possible to have parallel tangents on vertex of chord.
If they aren't parallel they will intersect or in your words they will be chord of contact .
Now we know tangents drawn on vertexes of Chord of parabola intercepts at right angle so they can't be parallel .
So every chord on a parabola be chord of contact