Solve for ϕ (complex solution)
ϕ=2\pi n_{1}+\pi -\arctan(\frac{2}{3})\text{, }n_{1}\in \mathrm{Z}
ϕ=2\pi n_{2}+\pi +\arctan(\frac{2}{3})\text{, }n_{2}\in \mathrm{Z}
Solve for ϕ
ϕ=2\pi n_{1}-\arccos(\frac{3\sqrt{13}}{13})+\pi \text{, }n_{1}\in \mathrm{Z}
ϕ=2\pi n_{2}+\arccos(\frac{3\sqrt{13}}{13})+\pi \text{, }n_{2}\in \mathrm{Z}
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