List questions from trigonometric-series

Published on 23 Sep 2013 - 18:03

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How to simplify these trigonometry terms? (involving sin, cos, tan, cot)

Published on 26 Mar 2026 - 1:03

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Extensions of Ramanujan's Cos/Cosh Identity

Published on 07 Oct 2013 - 5:50

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How to find the sum of a geometric progression involving cos using complex numbers?

Published on 09 Oct 2013 - 16:05

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Proof of $\sum_{n=1}^{\infty}\frac1{n^3}\frac{\sinh\pi n\sqrt2-\sin\pi n\sqrt2}{{\cosh\pi n\sqrt2}-\cos\pi n\sqrt2}=\frac{\pi^3}{18\sqrt2}$

Published on 12 Oct 2013 - 15:19

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Trigonometry and complex numbers

Published on 19 Oct 2013 - 22:27

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How can I compute this infinite series with cosines?

Published on 31 Oct 2013 - 10:55

306

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Limit of maximum of $f_{n}(x)=\frac{1}{n}(\sin{x}+\sin{(2x)}+\cdots+\sin{(nx)})$

Published on 04 Nov 2013 - 16:33

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$\sum_{k=0}^{n-1}\sin(k\frac{\pi}{n}+\theta)$

Published on 04 Nov 2013 - 21:25

898

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$\prod_{k=1}^{n-1}\cos\left(\theta+\frac{k\pi}{n}\right)$

Published on 14 Nov 2013 - 0:54

234

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Convergence on sum of cos

Published on 19 Nov 2013 - 20:48

172

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new $\arctan$ series working for any $x$?

Published on 24 Nov 2013 - 8:47

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Fourier Series coefficients/Trigonometric functions

Published on 24 Nov 2013 - 15:29

143

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Use Osborn's Rule to suggest an identity involving cothx^2 and cosechx^2 then to solve

Published on 04 Dec 2013 - 15:27

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Complex number trigonometry problem

Published on 10 Dec 2013 - 11:57

List Question

Infinite Series $\sum\limits_{n=1}^{\infty}\frac{1}{4^n\cos^2\frac{x}{2^n}}$

How to simplify these trigonometry terms? (involving sin, cos, tan, cot)

Extensions of Ramanujan's Cos/Cosh Identity

How to find the sum of a geometric progression involving cos using complex numbers?

Proof of $\sum_{n=1}^{\infty}\frac1{n^3}\frac{\sinh\pi n\sqrt2-\sin\pi n\sqrt2}{{\cosh\pi n\sqrt2}-\cos\pi n\sqrt2}=\frac{\pi^3}{18\sqrt2}$

Trigonometry and complex numbers

How can I compute this infinite series with cosines?

Limit of maximum of $f_{n}(x)=\frac{1}{n}(\sin{x}+\sin{(2x)}+\cdots+\sin{(nx)})$

$\sum_{k=0}^{n-1}\sin(k\frac{\pi}{n}+\theta)$

$\prod_{k=1}^{n-1}\cos\left(\theta+\frac{k\pi}{n}\right)$

Convergence on sum of cos

new $\arctan$ series working for any $x$?

Fourier Series coefficients/Trigonometric functions

Use Osborn's Rule to suggest an identity involving cothx^2 and cosechx^2 then to solve

Complex number trigonometry problem

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