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D( x )
1-x^(4/3) < 0
1-x^(4/3) < 0
1-x^(4/3) < 0
-1*x^(4/3) < -1
-1*x^(4/3) < -1 // * -1
1*x^(4/3) > 1
1*x^(4/3) > 1 // : 1
x^(4/3) > 1/1
x^(4/3) > 1
x >= 0
x^(4/3) > 1 // ^ 1/4/3
x^(4/3) > 1 // ^ 3/4
abs(x) > 1
x > 1
x in (1:+oo)
x in (-oo:1>
(1-x^(4/3))^(3/2) = 0
-1*x^(4/3) = -1 // : -1
x^(4/3) = 1
x^(4/3) = 1 // ^ 3
x^4 = 1 // ^ 1/4
abs(x) = 1
x = 1 or x = -1
x in { 1, -1 }
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