# Complex Variables : Differentiation - Quotient Formula

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7. Prove that dzn-1/ dz = nzn-1, for the derivative of zn remains valid when n is a negative integer (n = -1, -2, ???), provided that zâ‰ 0.

(Suggestion: Write m = -n and use the formula for the derivative of a quotient of two functions).

See the attached file.

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#### Solution Summary

The quotient rule is used to prove a differential equality. The solution is detailed and well presented.

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