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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
((c^3)/2)*((2*c^1)/2+(3*c^-3)/2) = 0
((c^3)/2)*((2*c)/2+(3*c^-3)/2) = 0
1/2*c^3*(c+3/2*c^-3) = 0
c+3/2*c^-3 = 0
c*(3/2*c^-4+1) = 0
3/2*c^-4 = -1 // : 3/2
c^-4 = -2/3
-4 < 0
1/(c^4) = -2/3 // * c^4
1 = -2/3*c^4 // : -2/3
-3/2 = c^4
c = 0
1/2*c*c^3 = 0
( 1/2*c^3 )
1/2*c^3 = 0 // : 1/2
c^3 = 0
c = 0
( c )
c = 0
c in { 0}
c belongs to the empty set
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