Solution equation: 9x ^ 4-4x ^ 2 + 4x-1 = 0

9x^4=4x^2-4x+1=（2x-1）^2
3x^2=2x-1
3x^2-2x+1=0
（3x+1）（x-1）=0
X = 1 or - 1 / 3

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