deletions | additions       diff --git a/untitled.tex b/untitled.tex  index 7c3ad17..97f692c 100644  --- a/untitled.tex  +++ b/untitled.tex 
...
$\Leftrightarrow x^2+y^2 + Re(cx-dy+i(dx+cy))+b=0$\\  $\Leftrightarrow x^2 +y^2 + cx-dy + b=0$\\  $\Leftrightarrow (x^2+cx) +(y^2-dy) +b =0$\\  $\Leftrightarrow (x+\frac{1}{2}c)^2 + (y-\frac{1}{2}d)^2 = -b + \frac{1}{4}(c^2+d^2)$\\ \frac{1}{4}(c^2+d^2)$ by completing the square\\