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Verified answer
4cos²x - 4 cosx + 1 = 0misal
y = cos x
maka
4y² - 4y + 1 = 0
(2y - 1)² = 0
y = 1/2
cosx = 1/2
x = -π/3 + 2π.c ( c ∈ Integer )
x = π/3 + 2π.c