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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
(c^-5*((-3*c^-1)/(-3)))^3 = 0
1*c^-18 = 0 // : 1
c^-18 = 0
c należy do O
c belongs to the empty set
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