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D( x )
x/2 < 0
x/2 < 0
x/2 < 0
1/2*x+0 < 0 // - 0
1/2*x < 0 // : 1/2
x < 0/1/2
x < 0
x in <0:+oo)
2*x^2 = (x/2)^0.5 // - (x/2)^0.5
2*x^2-(x/2)^0.5 = 0
2*x^2-(1/2)^0.5*x^0.5 = 0
x^0.5*(2*x^1.5-(1/2)^0.5) = 0
2*x^1.5 = (1/2)^0.5 // : 2
x^1.5 = ((1/2)^0.5)/2
x = (((1/2)^0.5)/2)^(1/0.5)
x^0.5 = 0
1*x^0.5 = 0 // : 1
x^0.5 = 0
x = 0
x in { (((1/2)^0.5)/2)^(1/0.5), 0 }
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