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WIMS ªº¼Ð»x
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<pre>
     x=(1-s)*cos(t+pi*s)+s*cos(2*t)
     y=(1-s)*sin(t+pi*s)-s*sin(2*t)
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<pre>
     -1&lt;x&lt;1, -1&lt;y&lt;1, 0&lt;t&lt;2*pi.
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ø»s¤é´Á¡G 03-27-1998, &copy; XIAO, Gang.
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