z-1/z=0

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Solution for z-1/z=0 equation: 


D( z )

z = 0

z = 0

z = 0

z in (-oo:0) U (0:+oo)

z-(1/z) = 0

z-z^-1 = 0

1*z^1-1*z^-1 = 0

(1*z^2-1*z^0)/(z^1) = 0 // * z^2

z^1*(1*z^2-1*z^0) = 0

z^1

z^2-1 = 0

z^2-1 = 0

DELTA = 0^2-(-1*1*4)

DELTA = 4

DELTA > 0

z = (4^(1/2)+0)/(1*2) or z = (0-4^(1/2))/(1*2)

z = 1 or z = -1

z in { -1, 1} 

z in { -1, 1 }

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