How do you solve the following equation over an unrestricted domain;
$$\left| \cos { \left( 2x \right) } \right| = \frac { 1 }{ 2 } $$
I can solve half of it;
$$\cos { \left( 2x \right) } =\frac { 1 }{ 2 } \\ x=\pi n\pm \frac { \pi }{ 6 } $$
but how do you do the other half
$$\cos { \left( 2x \right) } =-\frac { 1 }{ 2 } $$
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