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PolarPlot[Sech[θ - Round[θ/((2*π)/(9/11))]*((2*π)/(9/11))], {θ, 0, 11*2*π}]
PolarPlot[Sech[θ - Round[θ/((2*π)/(9/11))]*((2*π)/(9/11))], {θ, 0, 11*2*π}]
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