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D( c )
c^2 = 0
c^2 = 0
c^2 = 0
1*c^2 = 0 // : 1
c^2 = 0
c = 0
c in (-oo:0) U (0:+oo)
(2*c)/(c^2)-36 = 0
2*c^-1 = 36 // : 2
c^-1 = 18
-1 < 0
1/(c^1) = 18 // * c^1
1 = 18*c^1 // : 18
1/18 = c^1
c = 1/18
c = 1/18
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