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plot x=(3 cos^2 t sin t)/(cos^3 t - sin^3 t), y=(3 cos t sin^2 t)/(cos^3 t - sin^3 t)
plot x=(3 cos^2 t sin t)/(cos^3 t - sin^3 t), y=(3 cos t sin^2 t)/(cos^3 t - sin^3 t)
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