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ReferencesAbramowitz, M. and Stegun, I. A. (Eds.). "Circular Functions." §4.3 in Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, 9th printing. New York: Dover, pp. 71-79, 1972.Bertrand, J. Exercise II in Traité d'algbre, Vols. 1-2, 4th ed. Paris, France: Librairie de L. Hachette et Cie, p. 285, 1865.Beyer, W. H. CRC Standard Mathematical Tables, 28th ed. Boca Raton, FL: CRC Press, p. 215, 1987.Erdélyi, A.; Magnus, W.; Oberhettinger, F.; and Tricomi, F. G. Higher Transcendental Functions, Vol. 1. New York: Krieger, p. 6, 1981.Gellert, W.; Gottwald, S.; Hellwich, M.; Kästner, H.; and Künstner, H. (Eds.). VNR Concise Encyclopedia of Mathematics, 2nd ed. New York: Van Nostrand Reinhold, 1989.Glaisher, J. W. L. "On Certain Numerical Products in which the Exponents Depend Upon the Numbers." Messenger Math. 23, 145-175, 1893.Gradshteyn, I. S. and Ryzhik, I. M. Tables of Integrals, Series, and Products, 6th ed. San Diego, CA: Academic Press, 2000.Jeffrey, A. "Trigonometric Identities." §2.4 in Handbook of Mathematical Formulas and Integrals, 2nd ed. Orlando, FL: Academic Press, pp. 111-117, 2000.Sloane, N. J. A. Sequences A002431/M0124, A036278, A069855, and A089929 in "The On-Line Encyclopedia of Integer Sequences."Spanier, J. and Oldham, K. B. "The Tangent

tan(x)

and Cotangent

cot(x)

Functions." Ch. 34 in An Atlas of Functions. Washington, DC: Hemisphere, pp. 319-330, 1987.Tropfke, J. Teil IB, §2. "Die Begriffe von Tangens und Kotangens eines Winkels." In Geschichte der Elementar-Mathematik in systematischer Darstellung mit besonderer Berücksichtigung der Fachwörter, fünfter Band, zweite aufl. Berlin and Leipzig, Germany: de Gruyter, pp. 23-28, 1923.Zwillinger, D. (Ed.). "Trigonometric or Circular Functions." §6.1 in CRC Standard Mathematical Tables and Formulae. Boca Raton, FL: CRC Press, pp. 452-460, 1995.Referenced on Wolfram|AlphaCotangent Cite this as:

Weisstein, Eric W. "Cotangent." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Cotangent.html

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