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