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- This series can be inverted giving the expansion for the inverse function [[ArcCoshc]]: : \( \displaystyle \mathrm{ArcCoshc}(z)=\frac{1}{z}+ \frac{1}{2} \frac{1}{z^3}+ \frac{13}{24} \frac{1}{z^5}+ \f4 KB (509 words) - 18:26, 30 July 2019