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The line Ax+By+C=0, cuts the circle x^(2...

The line `Ax+By+C=0`, cuts the circle `x^(2)+y^(2)+ax+by+c=0` in P and Q and the line `A'x+B'y+C'=0` cuts the circle `x^(2)+y^(2)+dx+b'y+c'=0` in R and S. If the four points P,Q,R,S are concyclic, then
`D=|(a-a',b-b',c-c'),(A,B,C),(A',B',C')|=0`

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