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D( x )
0.1^7 = 0
0.1^7 = 0
0.1^7 = 0
0.1^7 = 0
x belongs to the empty set
x in (-oo:+oo)
((2*x^5)^8)/(0.1^7) = 0
(256/(0.1^7))*x^40 = 0 // : 256/(0.1^7)
x^40 = 0
x = 0
x = 0
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