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D( x )
x < 0
x < 0
x in <0:+oo)
64*x^(1/2) = 8*x^2 // - 8*x^2
64*x^(1/2)-(8*x^2) = 0
64*x^(1/2)-8*x^2 = 0
t_1 = x^(1/2)
64*t_1^1-8*t_1^4 = 0
64*t_1-8*t_1^4 = 0
8*t_1*(8-t_1^3) = 0
-1*t_1^3 = -8 // : -1
t_1^3 = 8
t_1^3 = 8 // ^ 1/3
t_1 = 2
8*t_1 = 0
8*t_1 = 0 // : 8
t_1 = 0
t_1 = 2
x^(1/2)-2 = 0
1*x^(1/2) = 2 // : 1
x^(1/2) = 2
x^(1/2) = 2 // ^ 2
x = 4
t_1 = 0
x^(1/2)+0 = 0
x^(1/2) = 0
1*x^(1/2) = 0 // : 1
x^(1/2) = 0
x = 0
x in { 4, 0 }
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