曲線指令
Author: 藍邦偉  老師

u = Vector((x(Corner[1]), 0), (x(Corner[3]), 0))
v = Vector((0, y(Corner[1])), (0, y(Corner[3])))
Graph = 0 (slider from 0 to 4, step 1)
C_1 = CurveCartesian(2 * cos(t), 2 * sin(t), t, 0, 6.283185307179586)
C_2 = CurveCartesian(2 + 3 * cos(t), 3 + 2 * sin(t), t, 0, 6.283185307179586)
C_3 = CurveCartesian(t^(2), 2 + t, t, -10, 10)
Γ_4 = CurveCartesian(1 + 2 * sec(t), sqrt(2) * tan(t), t, 0, 6.283185307179586)