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2 cos(2x + 60) = 1
cos(2x +60) = 1/2
cos(2x +60) = cos 60
2x +60 = 60 + k.360
2x = 0 + k.360
x = 0 + k.180
k = 0 ==> x = 0
k = 1 ==> x = 180
k = 2 ==> x = 360
atau
2x +60 = -60 + k.360
2x = -120 + k.360
x = -60 + k.180
k = 1 ==> x = 120
k = 2 ==> x = 300