If two points P & Q on the hyperbola ,x^...

If two points `P & Q` on the hyperbola ,`x^2/a^2-y^2/b^2=1` whose centre is C be such that CP is perpendicularal to `CQ and a lt b`1 ,then prove that `1/(CP^2)+1/(CQ^2)=1/a^2-1/b^2`.

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