The points P(cp,c/p) and Q(cq,c/q) lie on the rectangular hyperbola xy=c^2. Show that the equation of the chord PQ is pqy+x=c(p=q), and deduce the equation of the tangent at the point P.(adsbygoogle = window.adsbygoogle || []).push({});

I can do the proving. And I can find the tangent as well if the word "deduce" is not there. How can you deduce the equation by refering to the chord PQ?

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# Coordinate Geometry

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