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d/dx x^-n = -nx^-n-1

Use the factorization of a difference of nth powers given in this section (not using quotient rule)

My attempt gets me from the definition of the derivative to (1/n^(n-1)) n times... I need the negative. I get nx^(-n-1) instead of -nx^(n-1).

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# Prove the case r= -n (n is a positive integer)of the general power rule

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