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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
1/(x^2) = x^2 // - x^2
1/(x^2)-x^2 = 0
x^-2-x^2 = 0
t_1 = x^2
1*t_1^-1-1*t_1^1 = 0
1*t_1^-1-1*t_1^1 = 0
(1*t_1^0-1*t_1^2)/(t_1^1) = 0 // * t_1^2
t_1^1*(1*t_1^0-1*t_1^2) = 0
t_1^1
1-t_1^2 = 0
1-t_1^2 = 0
DELTA = 0^2-(-1*1*4)
DELTA = 4
DELTA > 0
t_1 = (4^(1/2)+0)/(-1*2) or t_1 = (0-4^(1/2))/(-1*2)
t_1 = -1 or t_1 = 1
t_1 in { -1, 1}
t_1 = -1
x^2+1 = 0
1*x^2 = -1 // : 1
x^2 = -1
t_1 = 1
x^2-1 = 0
1*x^2 = 1 // : 1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x in { 1, -1 }
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