4cos^2(x)-4cos(x)+1=0
(2cos(x) - 1)²=0
2cos(x) - 1 =0
cos(x) = 1/2
х= ± π/3 +2ππn n∈Z
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4cos^2(x)-4cos(x)+1=0
(2cos(x) - 1)²=0
2cos(x) - 1 =0
cos(x) = 1/2
х= ± π/3 +2ππn n∈Z