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D( x )
x^5 = 0
(((x^2*x^3)/4)/(x^5))/4 = 0
x^5 = 0
x^5 = 0
1*x^5 = 0 // : 1
x^5 = 0
x = 0
(((x^2*x^3)/4)/(x^5))/4 = 0
(((x^2*x^3)/4)/(x^5))/4 = 0
1/16 = 0
x belongs to the empty set
x in (-oo:0) U (0:+oo)
((((x^2*x^3)/4)/(x^5))/4)^-2 = 0
256 = 0
x belongs to the empty set
x belongs to the empty set
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