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maka :
(x + 1/x)² = 1²
x² + 1/x² +2 = 1
maka : x² + 1/x² = 1 -2 = -1
dan (x² + 1/x²)² = = -1²
x⁴ + 1/x⁴ +2 =1
x⁴ + 1/x⁴ = 1-2 = -1