Solve for θ, r, c, s
r=\frac{s}{21\pi }\text{, }\theta =21\pi \approx 65.973445725\text{, }s\in \begin{bmatrix}-84\pi ,84\pi \end{bmatrix}\text{, }c=\arcsin(\frac{s}{84\pi })+2\pi n_{2}\text{, }n_{2}\in \mathrm{Z}\text{; }r=\frac{s}{21\pi }\text{, }\theta =21\pi \approx 65.973445725\text{, }s\in \begin{bmatrix}-84\pi ,84\pi \end{bmatrix}\text{, }c=-\arcsin(\frac{s}{84\pi })+2\pi n_{1}+\pi \text{, }n_{1}\in \mathrm{Z}
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