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If S-= x^(2) + y^(2) + 2gx + 2fy + c= 0repre- sents a circle then show that the straight line lx + my + n = 0 (i) touches the circle S = 0 if (g^(2)+f^(2)-c) = ((gl+mf-n)^(2))/((l^(2)+m^(2))) |
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