Solve for ϕ
ϕ=2\pi n_{1}+\arccos(\frac{4\sqrt{2}}{7})\text{, }n_{1}\in \mathrm{Z}
ϕ=2\pi n_{2}-\arccos(\frac{4\sqrt{2}}{7})+2\pi \text{, }n_{2}\in \mathrm{Z}
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Examples
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