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If y=x be the tangent to the circle x2+y2+2gx+2fy+c=0 at ponit P such that the distance of P from origin is 4√2, then the value of c is

Answer» If y=x be the tangent to the circle x2+y2+2gx+2fy+c=0 at ponit P such that the distance of P from origin is 42, then the value of c is


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