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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
(1/4)/c = 16 // - 16
(1/4)/c-16 = 0
1/4*c^-1 = 16 // : 1/4
c^-1 = 64
-1 < 0
1/(c^1) = 64 // * c^1
1 = 64*c^1 // : 64
1/64 = c^1
c = 1/64
c = 1/64
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