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If PQ, PR are tangents from a point P(x(...

If PQ, PR are tangents from a point `P(x_(1),y_(1))` to the circle `x^(2)+y^(2)+2gx+2fy+c=0` show that the circumcircle of the triangle PQR is `(x-x_(1))(x+g)+(y-y_(1))(y+f)=0`

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