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[" If the chord of contact of the tangents from a point on "],[" the circle "x^(2)+y^(2)=a^(2)" to the circle "x^(2)+y^(2)=b^(2)" touches "],[" the circle "x^(2)+y^(2)=c^(2)],[a^(2),b^(2),c^(2)" are in "]

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If the chord of contact of tangents from a point on the circle x^(2) + y^(2) = a^(2) to the circle x^(2)+ y^(2)= b^(2) touches the circle x^(2) + y^(2) = c^(2) , then a, b, c are in-

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