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x in (-oo:+oo)
(1/4)*x^2 < 1/16 // - 1/16
(1/4)*x^2-(1/16) < 0
(1/4)*x^2-1/16 < 0
1/4*x^2 < 1/16
1/4*x^2 < 1/16 // : 1/4
x^2 < 1/16/1/4
x^2 < 1/4
x^2 < 1/4 // ^ 1/2
abs(x) < 1/2
x in (-1/2:1/2)
x in (-1/2:1/2)
(-1/2:1/2)
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