. If a is the angle subtended at P
If alpha is the angle subtended at P(x1, y1) by the circle S º x2 + y2 + 2gx + 2fy + c = 0, then
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If alpha is the angle subtended at P(x1, y1) by the circle S º x2 + y2 + 2gx + 2fy + c = 0, then