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[" If "OA" and "OB" are the tangents fro...

[" If "OA" and "OB" are the tangents from the origin to the circle "x^(2)+y^(2)+2gx+2fy+c=0],[" and "C" is the centre of the circle,then the area of the quadrilateral "OACB" is "],[sqrt(c(g^(2)+f^(2)-c))]

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