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		<dc:title>Polar coordinates</dc:title>
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		<dc:identifier>http://knowino.org/wiki/Polar_coordinates</dc:identifier>
		<dc:date>2010-12-20</dc:date>
		<dc:creator>Paul Wormer</dc:creator>
		<dc:contributor>Boris Tsirelson</dc:contributor>
		<dc:contributor>Anonymous user of Knowino</dc:contributor>
		<dc:contributor>Anonymous user of Knowino</dc:contributor>
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