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The correct Answer is:
`(|g^(2)+f^(2)-c|)/(2sqrt(g^(2)+f^(2)))`
Chord of contact from the origin `-= gx +fy+c =0`
and that from `(g,f) -= gx+fy+g(x+g) +f(y+f)+c=0`
or `2gx+2fy+g^(2)+f^(2)+c=0`
`:. `Required distance `=(|(g^(2)+f^(2)+c)/(2)-c|)/(sqrt(g^(2)+f^(2)))=(|g^(2)+f^(2)-c|)/(2sqrt(g^(2)+f^(2)))`
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