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D( x )
x < 0
x = 0
x < 0
x = 0
x = 0
x in (0:+oo)
(0.5*x^(-1/2))/2 = 1 // - 1
(0.5*x^(-1/2))/2-1 = 0
0.25*x^(-1/2) = 1 // : 0.25
x^(-1/2) = 4
-1/2 < 0
1/(x^(1/2)) = 4 // * x^(1/2)
1 = 4*x^(1/2) // : 4
1/4 = x^(1/2)
x^(1/2) = 1/4 // ^ 2
x = 1/16
x = 1/16
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