z^-7/z^-9

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Solution for z^-7/z^-9 equation: 


D( z )

z^-9 = 0

z = 0

z^-9 = 0

z^-9 = 0

1*z^-9 = 0 // : 1

z^-9 = 0

z należy do O

z = 0

z = 0

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

(z^-7)/(z^-9) = 0

1*z^2 = 0 // : 1

z^2 = 0

z = 0

z in { 0} 

z belongs to the empty set

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