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D( x )
(100*x^2)^2 = 0
(100*x^2)^2 = 0
(100*x^2)^2 = 0
10000*x^4 = 0 // : 10000
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
((3*x^2)^3*(2*x^2)^4)/((100*x^2)^2) = 0
27/625*x^10 = 0 // : 27/625
x^10 = 0
x = 0
x in { 0}
x belongs to the empty set
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