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Recently Referred Formulae

-\frac{n}{x^{n+1}}=x^{-(n+1)}
f_k(x)=a_k(x-c)^k;\ x
f_k(x)=\frac{f^{(k)}(a)}{k!}(x-a)^k;
\sum_{k=0}^{\infty}\frac{f^{(k)}(a)}{k!}(x-a)^k
x^k