p = 3 (slider from 1 to 12, step 1)
q = 1 (slider from 1 to 12, step 1)
a = CurveCartesian(sin(p * t), cos(q * t), t, 0, 6.283185307179586)
t = 5.82 (slider from 0 to 6.283185307179586, step 0.01)
A: (sin(p * t), cos(q * t))