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D( x )
x < 0
x < 0
x in <0:+oo)
((3*x^(10^-3))/15)*x^(10^2) = 0
1/5*x^(100001/1000) = 0 // : 1/5
x^(100001/1000) = 0
x = 0
x = 0
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