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Let p be the perpendicular distance from the centre C of the hyperbola `(x^(2))/(a^(2))-(y^(2))/(b^(2))=1` to the tangent drawn at a point R on the hyperbola. If S and S' are the two foci of the hperbola, then prove that `(RS+RS')^(2)=4a^(2)(1+(b^(2))/(p^(2)))`.

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