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\[ \left({r\cos\theta_{\,{\rm{i}}}\,\,,\,\,r\,sen\,\theta_{\,{\rm{i}}}}\right)\mathop\to\limits_{r\,\,\to\,\,0}\left({0,0}\right)\,\,\,\,\,\,\left({{\rm{i}}= 1,2}\right) \]

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