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D( x )
(1-x^2)^2 = 0
(1-x^2)^2 = 0
(1-x^2)^2 = 0
-1*x^2 = -1 // : -1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x in (-oo:-1) U (-1:1) U (1:+oo)
0 = (2*x)/((1-x^2)^2) // - (2*x)/((1-x^2)^2)
0-((2*x)/((1-x^2)^2)) = 0
-2*x*(1-x^2)^-2 = 0
(-2*x)/((1-x^2)^2) = 0
-2*x = 0 // : -2
x = 0
x = 0
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