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D( c )
c^5 = 0
c^5 = 0
c^5 = 0
1*c^5 = 0 // : 1
c^5 = 0
c = 0
c in (-oo:0) U (0:+oo)
c^3-(4*c^3)+8/(c^5) = 0
c^3-4*c^3+8/(c^5) = 0
8*c^-5-3*c^3 = 0
c^3*(8*c^-8-3) = 0
8*c^-8 = 3 // : 8
c^-8 = 3/8
-8 < 0
1/(c^8) = 3/8 // * c^8
1 = 3/8*c^8 // : 3/8
8/3 = c^8
c^8 = 8/3 // ^ 1/8
abs(c) = (8/3)^(1/8)
c = (8/3)^(1/8) or c = -(8/3)^(1/8)
c^3 = 0
1*c^3 = 0 // : 1
c^3 = 0
c = 0
c in { 0}
c in { (8/3)^(1/8), -(8/3)^(1/8) }
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