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