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D( c )
c^8 < 0
16*c^12 < 0
(16*c^12)^0.25 = 0
c^8 < 0
c^8 < 0
1*c^8 < 0
1*c^8 < 0 // : 1
c^8 < 0/1
c^8 < 0
c belongs to the empty set
16*c^12 < 0
16*c^12 < 0
16*c^12 < 0
16*c^12 < 0 // : 16
c^12 < 0/16
c^12 < 0
c belongs to the empty set
(16*c^12)^0.25 = 0
(16*c^12)^0.25 = 0
2*c^3 = 0 // : 2
c^3 = 0
c = 0
c in (-oo:0) U (0:+oo)
(9*(c^8)^0.5)/((16*c^12)^0.25) = 0
9/2*c = 0 // : 9/2
c = 0
c in { 0}
c belongs to the empty set
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