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D( x )
x < 0
x^(3/2) = 0
x < 0
x^(3/2) = 0
x^(3/2) = 0
1*x^(3/2) = 0 // : 1
x^(3/2) = 0
x = 0
x in (0:+oo)
(4*5*x^(5/4)*x^(13/4))/(x^(3/2)) = 0
20*x^3 = 0 // : 20
x^3 = 0
x = 0
x in { 0}
x belongs to the empty set
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