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x⁴-x²=0
x²(x²-1)=0
x²(x-1)(x+1)=0
x=0 ∨ x=1 ∨ x=-1
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x⁴-x²=0
x²(x²-1)=0
x²(x-1)(x+1)=0
x=0 ∨ x=1 ∨ x=-1