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D( x )
625*x^4 < 0
625*x^4 < 0
625*x^4 < 0
625*x^4 < 0
625*x^4 < 0 // : 625
x^4 < 0/625
x^4 < 0
x belongs to the empty set
x in (-oo:+oo)
(625*x^4)^(3/2) = 0
15625*x^6 = 0 // : 15625
x^6 = 0
x = 0
x = 0
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