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f(-x)= 2(-x)^2 - 2 (-x) +1
f(-x)= 2x^2 +2x +1
f(x)<f(-x)
2x^2 -2x +1< 2x^2 +2x +1
2x^2 -2x +1 - 2x^2 -2x -1<0
-4x<0 /:(-4)
x>0
x∈(0;+∞)