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D( w )
4*w^5 = 0
4*w^5 < 0
4*w^5 = 0
4*w^5 = 0
4*w^5 = 0 // : 4
w^5 = 0
w = 0
4*w^5 < 0
4*w^5 < 0
4*w^5 < 0
4*w^5 < 0 // : 4
w^5 < 0/4
w^5 < 0
w^5 < 0 // ^ 1/5
w < 0
w in (-oo:0)
w in (0:+oo)
(4*w^5)^(-3/2) = 0
1/8*w^(-15/2) = 0 // : 1/8
w^(-15/2) = 0
w należy do O
w belongs to the empty set
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