4z/z^2-1

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Solution for 4z/z^2-1 equation: 


D( z )

z^2 = 0

z^2 = 0

z^2 = 0

1*z^2 = 0 // : 1

z^2 = 0

z = 0

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

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

4*z^-1 = 1 // : 4

z^-1 = 1/4

-1 < 0

1/(z^1) = 1/4 // * z^1

1 = 1/4*z^1 // : 1/4

4 = z^1

z = 4

z = 4

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