Simple expansions for sine and cosine

• Autores: Christopher S. Withers, Saralees Nadarajah
• Localización: International journal of mathematical education in science and technology, ISSN 0020-739X, Vol. 45, Nº. 5, 2014, págs. 738-741
• Idioma: inglés
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• Resumen

  • The student who has learned the binomial expansion and the formula for exp?(ix), is shown how to obtain simple expansions for sin?nx, cos?nx, sinh?nx, cosh?nx, sin?axand cos?axfor nany positive integer and a any real number.