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x²-1=(x+1)(x-1)
x⁴-1=(x²+1)(x²-1)=(x²+1)(x+1)(x-1)
(x-1)²=(x-1)(x-1)
Hence common factor = (x-1)
x⁴-1=(x²+1)(x²-1)=(x²+1)(x+1)(x-1)
(x-1)²=(x-1)(x-1)
Hence common factor = (x-1)
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