Arco di ellisse in forma parametrica

\[
\left\{
\begin{array}
x=x_{0}+a\cos t\
y=y_{0}+b\sin t
\end{array}
\right.  t\in\left[  \theta_{1},\theta_{2}\right]
\]

x0 = 0 (slider from -5 to 5)
y0 = 0 (slider from -5 to 5)
a = 1 (slider from 0 to 5)
b = 1 (slider from 0 to 5)
θ1 = 0 (slider from 0 to (2 * π))
θ2 = 6.283185307179586 (slider from 0 to (2 * π))
a_1 = CurveCartesian(x0 + (a * cos(t)), y0 + (b * sin(t)), t, θ1, θ2)