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D( x )
8*x < 0
8*x < 0
8*x < 0
8*x+0 < 0 // - 0
8*x < 0 // : 8
x < 0/8
x < 0
x in <0:+oo)
(x^2)/8 = (8*x)^(1/2) // - (8*x)^(1/2)
(x^2)/8-(8*x)^(1/2) = 0
1/8*x^2-2*2^(1/2)*x^(1/2) = 0
t_1 = x^(1/2)
1/8*t_1^4-2*2^(1/2)*t_1^1 = 0
1/8*t_1^4-2*2^(1/2)*t_1 = 0
t_1*(1/8*t_1^3-2*2^(1/2)) = 0
1/8*t_1^3 = -(-2*2^(1/2)) // : 1/8
t_1^3 = 16*2^(1/2)
t_1^3 = 16*2^(1/2) // ^ 1/3
t_1 = 2*2^(1/2)
t_1 = 0
t_1 = 0
t_1 = 2*2^(1/2)
x^(1/2)-(2*2^(1/2)) = 0
x^(1/2)-2*2^(1/2) = 0
1*x^(1/2) = -(-2*2^(1/2)) // : 1
x^(1/2) = 2*2^(1/2)
x^(1/2) = 2*2^(1/2) // ^ 2
x = 8
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 { 8, 0 }
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