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If P, Q are conjugate points with respect to a circles S -= x^2 + y^2 + 2gx + 2fy + c = 0then prove that the circle PQ as diameter cuts the circles S = 0 orthogonally.

Answer»


ANSWER :`2g_1 g_2 + 2f_1 f_2 = c_1 + c_2`


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