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parametric plot (exp(-t/2)(cos(3t/2)+sin(3t/2)/3),exp(-t/2)sin(3t/2)*4/3),t=0..2*pi
parametric plot (exp(-t/2)(cos(3t/2)+sin(3t/2)/3),exp(-t/2)sin(3t/2)*4/3),t=0..2*pi
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