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