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D( x )
x < 0
4*x^(3/2) = 0
x < 0
4*x^(3/2) = 0
4*x^(3/2) = 0
4*x^(3/2) = 0 // : 4
x^(3/2) = 0
x = 0
x in (0:+oo)
2*(-1/(4*x^(3/2)))*x^2 = 0
-1/2*x^(1/2) = 0 // : -1/2
x^(1/2) = 0
x = 0
x in { 0}
x belongs to the empty set
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