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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((25*x^-2)^3)/2 = 0
15625/2*x^-6 = 0 // : 15625/2
x^-6 = 0
x należy do O
x belongs to the empty set
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