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D( x )
(6*x^8)/Y = 0
(6*x^8)/Y = 0
(6*x^8)/Y = 0
6*Y^-1*x^8 = 0 // : 6*Y^-1
x^8 = 0
x = 0
x in (-oo:0) U (0:+oo)
((6*x^8)/Y)^-3 = 0
1/216*Y^3*x^-24 = 0 // : 1/216*Y^3
x^-24 = 0
x należy do O
x belongs to the empty set
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