If I want to polarplot a function, say, r=cos(t) , what instructions should I type?(adsbygoogle = window.adsbygoogle || []).push({});

I tried this before:

PolarPlot [ Cos[t] , {t, 0, 2 Pi} ]

but it just brought out the same thing!

PolarPlot [ Cos[t] , {t, 0, 2 Pi} ],not the graph!

Where did I went wrong??

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# PolarPloting by useing Mathematica

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