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<p>curves also include the <a href="page.php?w=Jordan_curve">Jordan curve</a>s (curves that enclose a region of the plane but need not be smooth) and the <a href="page.php?w=Graph_of_a_function">graphs of continuous function</a>s.</p>

<p><big>Symbolic representation</big></p>
<p>A plane curve can often be represented in <a href="page.php?w=Cartesian_coordinates">Cartesian coordinates</a> by an <a href="page.php?w=implicit_equation">implicit equation</a> of the form  for some specific function f. If this equation can be solved explicitly for y or x  - that</p><p>
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