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Focus and Directrix of a Parabola

Results

focus | (f_x, f_y)
directrix | y = -f_x^2/(f_y - v_y) - (x f_x)/(f_y - v_y) + (3 f_x v_x)/(f_y - v_y) - (2 v_x^2)/(f_y - v_y) + (x v_x)/(f_y - v_y) - f_y + 2 v_y
(assuming vertex (v_x, v_y))

Visual representation


(drawn with rotation angle 0°)

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