Two circles $S_1 = x^2 + y^2 + 2g_1x + 2f_1y + c_1 = 0$ and $S_2 = x^2 + y^2 + 2g_2x + 2f_2y + c_2 = 0$ cut each other orthogonally,then:
- A$2g_1g_2 + 2f_1f_2 = c_1 + c_2$
- B$2g_1g_2 - 2f_1f_2 = c_1 + c_2$
- C$2g_1g_2 + 2f_1f_2 = c_1 - c_2$
- D$2g_1g_2 - 2f_1f_2 = c_1 - c_2$
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