13 September 2025

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10 November 2024

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8 August 2024

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4 April 2024

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29 January 2021

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12 March 2019

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17 February 2018

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• curprev 13:3913:39, 17 February 2018 Durianaops talk contribs 323 bytes +323 Created page with "Let <math>a_1, a_2,\cdots, a_n</math> be real constants, <math>x</math> a real variable, and <cmath>f(x)=\cos(a_1+x)+\frac{1}{2}\cos(a_2+x)+\frac{1}{4}\cos(a_3+x)+\cdots+\frac..."