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D( c )
c < 0
c < 0
c in <0:+oo)
c^(3/2) = 21/8 // - 21/8
c^(3/2)-(21/8) = 0
c^(3/2)-21/8 = 0
1*c^(3/2) = 21/8 // : 1
c^(3/2) = 21/8
c^(3/2) = 21/8 // ^ 2
c^3 = 441/64 // ^ 1/3
c = (441/64)^(1/3)
c = (441/64)^(1/3)
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