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D( x )
x = 0
(-2*x)^3 = 0
x = 0
x = 0
(-2*x)^3 = 0
(-2*x)^3 = 0
-8*x^3 = 0 // : -8
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
((5*x^-2)^2)/((-2*x)^3) = 0
-25/8*x^-7 = 0 // : -25/8
x^-7 = 0
x należy do O
x belongs to the empty set
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