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Find the condition for the following set of curves to intersect orthogonally: `(x^2)/(a^2)-(y^2)/(b^2)=1` and `x y=c^2` `(x^2)/(a^2)+(y^2)/(b^2)=1` and `(x^2)/(A^2)-(y^2)/(B^2)=1.`

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