Solve for A
A=2\pi n_{1}-\arccos(\frac{1-\sqrt{5}}{2})+\pi \text{, }n_{1}\in \mathrm{Z}
A=2\pi n_{2}+\arccos(\frac{1-\sqrt{5}}{2})+\pi \text{, }n_{2}\in \mathrm{Z}
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Examples
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