Editing Parametric equation (section)

=== Lissajous curve ===
[[File:Lissajous curve 3by2.svg|thumbnail|A Lissajous curve where {{math|1=''k{{sub|x}}'' = 3}} and {{math|1=''k{{sub|y}}'' = 2}}.]]
A [[Lissajous curve]] is similar to an ellipse, but the {{mvar|x}} and {{mvar|y}} [[sinusoid]]s are not in phase. In canonical position, a Lissajous curve is given by
<math display="block">\begin{align}
  x &=  a\,\cos(k_xt) \\
  y &=  b\,\sin(k_yt)
\end{align}</math>
where {{mvar|k{{sub|x}}}} and {{mvar|k{{sub|y}}}} are constants describing the number of lobes of the figure.