find the polar equation of the curve x^2+y^2=2cx by first completing the square. How do I complete the square? I have not done it in this form before? Thanks
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$\displaystyle \begin{gathered} x^2 - 2cx + \underbrace {c^2 - c^2 }_{} + y^2 = 0 \hfill \\ \left( {x - c} \right)^2 + y^2 = c^2 \hfill \\ \end{gathered} $
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