Alternative proofs for inequalities of some trigonometric functions

• Autores: Bai-Ni Guo, Feng Qi
• Localización: International journal of mathematical education in science and technology, ISSN 0020-739X, Vol. 39, Nº. 3, 2008, págs. 384-389
• Idioma: inglés
• DOI: 10.1080/00207390701639516
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• Resumen

  • By using an identity relating to Bernoulli's numbers and power series expansions of cotangent function and logarithms of functions involving sine function, cosine function and tangent function, four inequalities involving cotangent function, sine function, secant function and tangent function are established.