Solve for the exact solutions in the interval [0,2π)\displaystyle {\left[{0},{2}\pi\right)}[0,2π). If the equation has no solutions, respond with DNE.
cos(2x)=cos(x)\displaystyle {\cos{{\left({2}{x}\right)}}}={\cos{{\left({x}\right)}}}cos(2x)=cos(x)
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