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D( x )
3*(1-x^2)^(4/3) = 0
3*(1-x^2)^(4/3) = 0
3*(1-x^2)^(4/3) = 0
( 1-x^2 )
-1*x^2 = -1 // : -1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
( 3 )
3 = 0
x belongs to the empty set
x in (-oo:-1) U (-1:1) U (1:+oo)
0 = (2*x)/(3*(1-x^2)^(4/3)) // - (2*x)/(3*(1-x^2)^(4/3))
0-((2*x)/(3*(1-x^2)^(4/3))) = 0
(-2/3)*x*(1-x^2)^(-(4/3)) = 0
-2/3*x*(1-x^2)^(4/3) = 0
( -2/3*x )
-2/3*x = 0 // : -2/3
x = 0
( 1-x^2 )
-1*x^2 = -1 // : -1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x in { 1}
x in { -1}
x = 0
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