2cos2x=1
cos2x=1/2
2x=cos-1(1/2) which is 60 but since you want radian it's 1/6pi
2x=1/6pi, 5/6pi (since you want it in between 0 and 2pi
x=1/12pi,5/12pi
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2cos2x=1
cos2x=1/2
2x=cos-1(1/2) which is 60 but since you want radian it's 1/6pi
2x=1/6pi, 5/6pi (since you want it in between 0 and 2pi
x=1/12pi,5/12pi