Draw polar curves

2011 12 17
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How can I draw two-fold polar circles? as illustrated in the link http://i39.tinypic.com/5peibo.png

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Mohamed
Mohamed 2011-12-17
I only could draw three-fold polar circles and four-fold polar circles as you can see in these figures http://i40.tinypic.com/21e2o21.png and http://i40.tinypic.com/wv33sx.jpg
Thank you in advance

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Paulo Silva
Paulo Silva 2011-12-17

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t=0:0.01:2*pi;
polar(t,abs(sin(t/2).*cos(t/2)));

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