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D( x )
e^2 = 0
e^2 = 0
e^2 = 0
e^2 = 0
x belongs to the empty set
x in (-oo:+oo)
x*((4*x^5)/(e^2)) = 0
(4/(e^2))*x^6 = 0 // : 4/(e^2)
x^6 = 0
x = 0
x = 0
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