To prove: If n is a positive integer and z = r ( cos θ + i sin θ ) is a non-zero complex number in trigonometric form, then z − n = r − n ( cos ( − n θ ) + i sin ( − n θ ) ) .

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Chapter 7.3, Problem 25E

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To prove: If n is a positive integer and z=r(cos θ + i sin θ) is a non-zero complex number in trigonometric form, then z−n=r−n(cos (− nθ) + i sin (− nθ)).

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