3 = 13 \sin ( \theta ) \cos ( \theta ) - \frac{ 169 }{ 512 } (9 \cdot 8 { \left( \cos ( \theta ) \right) }^{ 2 }
Solve for θ (complex solution)
\theta =\frac{2\pi n_{1}-i\ln(|\frac{\sqrt{2435}\left(-1872+1024i\right)+\left(-222885+121920i\right)}{231205}|)+\pi -\arctan(\frac{64}{117})}{2}\text{, }n_{1}\in \mathrm{Z}
\theta =\frac{2\pi n_{2}-i\ln(|\frac{\sqrt{2435}\left(1872-1024i\right)+\left(-222885+121920i\right)}{231205}|)+\pi -\arctan(\frac{64}{117})}{2}\text{, }n_{2}\in \mathrm{Z}
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