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Question: how to convert a parametric equations back to in terms of x and y with maple?

Question:how to convert a parametric equations back to in terms of x and y with maple?

Ex 95 Maple
December 07 2012
2

x = a*(3*cos(t) - cos(3*t))
y = a*(3*sin(t) - sin(3*t))

is there a library or function to convert above parametric equations into one equation in terms of x and y?

sys := x = a*(3*cos(t) - cos(3*t));
k := solve(sys, t);
simplify(subs(t=k[1], y = a*(3*sin(t) - sin(3*t))));

any simpler form?
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