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|x|=1
x=-1 v x=1
t=x^4>0
t²-3t-4=0
Δ=9+4*4=25
t=1/2(3-5)<0∉D v t=1/2(3+5)=4
x^4=4
x=-√2 v x=√2
Odp. x∈{-√2, -1, 1, √2}