(X²-1)²-5(X²-1)+4=0
(X²-1-4)(X²-1-1)=0
(X²-5)(X²-2)=0
(X-√5)(X+√5)(X-√2)(X+√2)=0
X1=√5 X2=-√5 X3=√2 X4=-√2
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