If $cos\frac{2π}{3c} = x$, then the value of x is

If $cos\frac{2π}{3c} = x$, then the value of x is
1). -$\frac{1}{2}$
2). $\frac{1}{2}$
3). $\frac{√3}{2}$
4). - $\frac{√3}{2}$

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