Nth Derivative of Reciprocal of Mth Power/Corollary
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Theorem
The $n$th derivative of $\dfrac 1 x$ with respect to $x$ is:
- $\dfrac {\d^n} {\d x^n} \dfrac 1 x = \dfrac {\paren {-1}^n n!} {x^{n + 1} }$
where $n!$ denotes $n$ factorial.
Proof
Follows directly from Nth Derivative of Reciprocal of Mth Power by putting $m = 1$.
$\blacksquare$