Parametric Curve(s)
$$$
\forall\alpha\in\{0,2\pi\}\quad\;$$$
$$$ \left \{ \begin{array}{r c l}
\theta(\alpha)& = &\alpha \\
r(\alpha)& = &0.1\times\left (\sin^{0.4}{(-2.5\cdot\alpha)}-1.4\right )
\end{array}\right .$$$
$$$
\forall\alpha\in\{0,2\pi\}\quad\;$$$
$$$ \left \{ \begin{array}{r c l}
\theta(\alpha)& = &\alpha \\
r(\alpha)& = &0.1\times\left (\sin^{0.4}{(-2.5\cdot\alpha)}-1.4\right )
\end{array}\right .$$$