a = 2 (slider from 1 to 10, step 1)
b = 6 (slider from 1 to 10, step 1)
c = CurveCartesian(3.0 * sin(a * t), 3.0 * cos(b * t), t, 0.0, 6.29)
Text1: "x(t) = 3 sin (" + a + " t)"
Text2: "y(t) = 3 cos (" + b + " t)"