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D( x )
x = 0
2*x^-4 = 0
x = 0
x = 0
2*x^-4 = 0
2*x^-4 = 0
2*x^-4 = 0 // : 2
x^-4 = 0
x należy do O
x in (-oo:0) U (0:+oo)
(3*y^-4)/(2*x^-4) = 0
3/2*x^4*y^-4 = 0 // : 3/2*y^-4
x^4 = 0
x = 0
x in { 0}
x belongs to the empty set
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