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D( c )
c < 0
18*c^(-1/2) = 0
c = 0
c < 0
18*c^(-1/2) = 0
18*c^(-1/2) = 0
18*c^(-1/2) = 0 // : 18
c^(-1/2) = 0
c należy do O
c = 0
c = 0
c in (0:+oo)
(3*c^((3/2)^4))/(18*c^(-1/2)) = 0
1/6*c^(89/16) = 0 // : 1/6
c^(89/16) = 0
c = 0
c in { 0}
c belongs to the empty set
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