-180/z=-90

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Solution for -180/z=-90 equation: 


D( z )

z = 0

z = 0

z = 0

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

-180/z = -90 // + 90

90-180/z = 0

-180*z^-1 = -90 // : -180

z^-1 = 1/2

-1 < 0

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

1 = 1/2*z^1 // : 1/2

2 = z^1

z = 2

z = 2

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