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D( x )
(-3*x^5)^2 = 0
(-3*x^5)^2 = 0
(-3*x^5)^2 = 0
9*x^10 = 0 // : 9
x^10 = 0
x = 0
x in (-oo:0) U (0:+oo)
((2*x^3)^3)/((-3*x^5)^2) = 0
8/9*x^-1 = 0 // : 8/9
x^-1 = 0
x należy do O
x belongs to the empty set
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