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D( Z )
Z = 0
Z = 0
Z = 0
Z in (-oo:0) U (0:+oo)
3-Z = 2/Z // - 2/Z
3-Z-(2/Z) = 0
3-Z-2*Z^-1 = 0
3*Z^0-1*Z^1-2*Z^-1 = 0
(3*Z^1-1*Z^2-2*Z^0)/(Z^1) = 0 // * Z^2
Z^1*(3*Z^1-1*Z^2-2*Z^0) = 0
Z^1
3*Z-Z^2-2 = 0
3*Z-Z^2-2 = 0
DELTA = 3^2-(-2*(-1)*4)
DELTA = 1
DELTA > 0
Z = (1^(1/2)-3)/(-1*2) or Z = (-1^(1/2)-3)/(-1*2)
Z = 1 or Z = 2
Z in { 1, 2}
Z in { 1, 2 }
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