[tex]\displaystyle\bf\\2Cos\frac{x}{6} =\sqrt{3} \\\\\\Cos\frac{x}{6} =\frac{\sqrt{3} }{2} \\\\\\\frac{x}{6} =\pm \ arcCos\frac{\sqrt{3} }{2} +2\pi n,n\in Z\\\\\\\frac{x}{6} =\pm \ \frac{\pi }{6} +2\pi n,n\in Z\\\\\\x=\pm \ \pi +12\pi n,n\in Z[/tex]
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[tex]\displaystyle\bf\\2Cos\frac{x}{6} =\sqrt{3} \\\\\\Cos\frac{x}{6} =\frac{\sqrt{3} }{2} \\\\\\\frac{x}{6} =\pm \ arcCos\frac{\sqrt{3} }{2} +2\pi n,n\in Z\\\\\\\frac{x}{6} =\pm \ \frac{\pi }{6} +2\pi n,n\in Z\\\\\\x=\pm \ \pi +12\pi n,n\in Z[/tex]