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D( w )
12*w^6 = 0
12*w^6 = 0
12*w^6 = 0
12*w^6 = 0 // : 12
w^6 = 0
w = 0
w in (-oo:0) U (0:+oo)
(40*w^4)/(12*w^6) = 0
10/3*w^-2 = 0 // : 10/3
w^-2 = 0
w należy do O
w belongs to the empty set
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