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D( x )
x^2*((8*x^6)/5) = 0
x^2*((8*x^6)/5) = 0
x^2*((8*x^6)/5) = 0
8/5*x^8 = 0 // : 8/5
x^8 = 0
x = 0
x in (-oo:0) U (0:+oo)
1/(x^2*((8*x^6)/5)) = 0
5/8*x^-8 = 0 // : 5/8
x^-8 = 0
x należy do O
x belongs to the empty set
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