$2 \exponential{\cos{\theta}}{2} + 9 \cos{\theta} + 4 = 0 $
Solve for θ
\theta =2\pi n_{1}+\frac{2\pi }{3}\text{, }n_{1}\in \mathrm{Z}
\theta =2\pi n_{1}+\frac{4\pi }{3}\text{, }n_{1}\in \mathrm{Z}
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