Hall, Arthur Graham; Frink, Fred Goodrich (January 1909). «Chapter II. The Acute Angle [14] Inverse trigonometric functions». Escrito en Ann Arbor, Michigan, USA. Trigonometry. Part I: Plane Trigonometry. New York, USA: Henry Holt and Company / Norwood Press / J. S. Cushing Co. - Berwick & Smith Co., Norwood, Massachusetts, USA. p. 15. Consultado el 12 de agosto de 2017. «[…] α = arcsin m: It is frequently read "arc-sinem" or "anti-sinem," since two mutually inverse functions are said each to be the función inversa (análisis matemático) of the other. […] A similar symbolic relation holds for the other función trigonométricas. […] This notation is universally used in Europe and is fast gaining ground in this country. A less desirable symbol, α = sin-1m, is still found in English and American texts. The notation α = inv sin m is perhaps better still on account of its general applicability. […]».
Hwang Chien-Lih (2005), «An elementary derivation of Euler's series for the arctangent function», The Mathematical Gazette89 (516): 469-470, doi:10.1017/S0025557200178404.
