List questions from trigonometric-series

Published on 22 Oct 2020 - 15:31

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Does this erratically-behaved infinite sum converge?

Published on 25 Oct 2020 - 23:10

43

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Simplification of Complex number summation

Published on 29 Oct 2020 - 22:18

32

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How do you find the intersection of these two trig curves?

Published on 07 Nov 2020 - 19:39

275

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Taylor expansion of $\lvert\sin(x)\rvert$

Published on 08 Nov 2020 - 7:00

133

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What is the Jacobi-Anger expansion of the $k$'th functional iterate of the sine function?

Published on 16 Nov 2020 - 21:05

559

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Proving the Fourier equation: $\frac{1}{2} L - x = \frac{L}{\pi}\sum^\infty_{n=1}\frac{1}{n} \sin\frac{2n\pi x}{L}$

Published on 29 Mar 2026 - 12:58

59

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Question about Fourier cosine series

Published on 07 Dec 2020 - 21:40

38

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Expansion of trigonometric function squared (with two different method)

Published on 18 Dec 2020 - 0:56

157

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$\frac{d}{dx}(\sin(x^{\frac{1}{3}}))$ from first principle

Published on 28 Dec 2020 - 21:10

103

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Evaluate:$\sum_{n=2}^{\infty}\frac{\tan \theta_{n}}{3^n\left(3-\tan^2\theta_{n}\right)}$

Published on 26 Mar 2026 - 11:18

82

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how to prove the multiplication formula for the cotangent function

Published on 05 Jan 2021 - 11:31

503

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Find the Maximum Trigonometric polynomial coefficient $A_{k}$

Published on 17 Jan 2021 - 13:33

321

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Prove $\sin(\pi/2-x)\cot(x+\pi/2) = -\sin(x)$

Published on 18 Jan 2021 - 3:24

346

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Show that $e^{ix}=\cos(x)+i\sin(x)$ using the Fourier Series only

Published on 19 Jan 2021 - 12:33

List Question

Trigonometric polynomial is non-negative for all integer values of m

Does this erratically-behaved infinite sum converge?

Simplification of Complex number summation

How do you find the intersection of these two trig curves?

Taylor expansion of $\lvert\sin(x)\rvert$

What is the Jacobi-Anger expansion of the $k$'th functional iterate of the sine function?

Proving the Fourier equation: $\frac{1}{2} L - x = \frac{L}{\pi}\sum^\infty_{n=1}\frac{1}{n} \sin\frac{2n\pi x}{L}$

Question about Fourier cosine series

Expansion of trigonometric function squared (with two different method)

$\frac{d}{dx}(\sin(x^{\frac{1}{3}}))$ from first principle

Evaluate:$\sum_{n=2}^{\infty}\frac{\tan \theta_{n}}{3^n\left(3-\tan^2\theta_{n}\right)}$

how to prove the multiplication formula for the cotangent function

Find the Maximum Trigonometric polynomial coefficient $A_{k}$

Prove $\sin(\pi/2-x)\cot(x+\pi/2) = -\sin(x)$

Show that $e^{ix}=\cos(x)+i\sin(x)$ using the Fourier Series only

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