Iterated square root expansions for the inverse cosine and inverse hyperbolic cosine
Abstract: Let , . Then and both converge to if and to if . Truncation errors for the two expressions are of the order of 2 and 2, respectively.
-  Preston C. Hammer, Iterative procedures for taking roots based on square roots, Math. Tables Aids Comput. 9 (1955), 68. MR 0069583, https://doi.org/10.1090/S0025-5718-1955-0069583-9
-  Richard Courant and Herbert Robbins, What Is Mathematics?, Oxford University Press, New York, 1941. MR 0005358
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