Parametric Curve(s)

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