Tangents OP and OQ are drawn from the origin 'O' to the circle x2 + y2 + 2gx + 2fy + c = 0. Then the equation of the circumcircle of the triangle OPQ is
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https://www.meritnation.com/ask-answer/question/from-a-point-p-a-b-two-tangents-pq-and-pr-are-drawn-to-a-c/conic-sections/10754807
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