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