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[" 18.The distance between the chords of contact of the tangents "],[" to the circlex "x^(2)+y^(2)+2gx+2fy+c=0" from the origin and the "],[" point "(g,f)" is "],[[" (a) "g^(2)+f^(2)+c," (b) "(1)/(2)(g^(2)+f^(2)+c)],[" (c) "(1)/(2)(g^(2)+f^(2)+c)/(sqrt(g^(2)+f^(2)))," (d) "(g^(2)+f^(2)-c)/(sqrt(g^(2)+f^(2)))]]

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