I've done no math in 20 years - used to do tons (with the not so great 
graphics of the time) saw this intriguing plot & banged my head against a 
wall for a couple of hours.

Then I just settled down & read the manual systematically, pretending it 
may have some info,  followed the examples and voila

(require plot)(plot-new-window? #t)
(define(xu u)(*(sin(* 33 u))(cos(* 9 u))))
(define(yu u)(*(sin(* 49 u))(sin(* 7 u))))
(plot(parametric(λ(t)(vector(xu t)(yu t)))0 1));


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