Cari nilai r
r=2\sqrt{\cos(\theta )}
r=-2\sqrt{\cos(\theta )}\text{, }\exists n_{1}\in \mathrm{Z}\text{ : }\left(\theta \geq 2\pi n_{1}-\frac{\pi }{2}\text{ and }\theta \leq 2\pi n_{1}+\frac{\pi }{2}\right)
Cari nilai θ
\theta =-\arccos(\frac{r^{2}}{4})+2\pi n_{1}\text{, }n_{1}\in \mathrm{Z}
\theta =\arccos(\frac{r^{2}}{4})+2\pi n_{2}\text{, }n_{2}\in \mathrm{Z}\text{, }\frac{r^{2}}{4}\leq 1\text{ and }|r|\leq 2
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