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D( x )
5*x^(10^3) = 0
5*x^(10^3) = 0
5*x^(10^3) = 0
5*x^1000 = 0 // : 5
x^1000 = 0
x = 0
x in (-oo:0) U (0:+oo)
(2.5*x^(10^9))/(5*x^(10^3)) = 0
0.5*x^999999000 = 0 // : 0.5
x^999999000 = 0
x = 0
x in { 0}
x belongs to the empty set
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