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D( x )
x < 0
x = 0
x < 0
x = 0
x = 0
x in (0:+oo)
x^-0.25*((2*x^1.5)/4) = 0
1/2*x^1.25 = 0 // : 1/2
x^1.25 = 0
x = 0
x in { 0}
x belongs to the empty set
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