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4x²-4x+1>0
x²-x-2<0
x²+x-2<0 /*4
4x²-4x-8< /*(-1)
-4x²+4x+8>0
9>0
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4x²-4x+1>0
x²+x-2<0 /*4
4x²-4x+1>0
4x²-4x-8< /*(-1)
4x²-4x+1>0
-4x²+4x+8>0
9>0