$$r = \frac { 4 } { 2 - 3 \cos \phi }$$
$r=\frac{4}{-3\cos(ϕ)+2}$
$\nexists n_{2}\in \mathrm{Z}\text{ : }ϕ=2\pi n_{2}+2\pi -\arccos(\frac{2}{3})\text{ and }\nexists n_{1}\in \mathrm{Z}\text{ : }ϕ=2\pi n_{1}+\arccos(\frac{2}{3})$
