2, cosine, 2, theta, plus, 1, equals, 0
Solve for θ
\theta =\pi n_{1}+\frac{2\pi }{3}\text{, }n_{1}\in \mathrm{Z}
\theta =\pi n_{1}+\frac{\pi }{3}\text{, }n_{1}\in \mathrm{Z}
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Examples
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