A series expansion of a logarithmic expression and a decreasing property of the ratio of two logarithmic expressions containing cosine - Li, Yan-Fang; Qi, Feng (Open mathematics (Warsaw, Poland), 2023)
Keywords: 26A09; 33B10; 41A58; cosine function; decreasing property; derivative formula; logarithmic expression; Logarithms; Maclaurin power series expansion; monotonicity rule; Power series; ratio of two differentiable functions; Series expansion; Trigonometric functions