List questions from trigonometric-series

Published on 16 May 2022 - 6:01

62

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Closed form expression for discrete-time sum of a cosinusoid

Published on 26 Mar 2026 - 9:41

34

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Trigonometric polynomails dense in $C(T)$ with period $1$ instead of $2\pi$

Published on 24 May 2022 - 12:23

1.5k

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On the Fourier series expansion of $\sin(\pi x)$ periodic on $(-\frac{1}{2}, -\frac{1}{2})$

Published on 28 May 2022 - 15:04

110

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$f(x)=\sum_{k=0}^{n}\binom{n}{k}\sin^{k}x\sec^{k-n}{x}.$

Published on 10 Jun 2022 - 21:18

1.6k

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Find the $Z$-transform of $\sin (\alpha k), k \ge0$

Published on 27 Mar 2026 - 16:53

108

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Series expansion of $x$ in terms of $\sin(\frac{x}{n})$

Published on 22 Jun 2022 - 3:42

158

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Is there any subsequence of the sequence $(\frac{\cos(\alpha - n \beta) - \lambda \cos(\alpha + n \beta)}{ \cos^n(\beta) })$ that converges?

Published on 27 Mar 2026 - 0:06

181

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Infinite Sum of an Inverse Trig Expression

Published on 14 Jul 2022 - 7:04

117

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Infinite sum of Spherical Bessel function and Cosine at odd index

Published on 20 Jul 2022 - 9:01

66

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Asymptotic average of cosine function

Published on 27 Jul 2022 - 9:54

112

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Evaluating the trace of two discrete Sine and Cosine transforms

Published on 29 Jul 2022 - 19:32

174

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Series of tan inverse x for x > 1

Published on 01 Aug 2022 - 13:49

57

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sums of imaginary exponentials

Published on 27 Mar 2026 - 18:08

516

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Integrating from $\int_0^\infty \frac{\sin(x)}x dx$ with year $10$ mathematics?

Published on 28 Aug 2022 - 11:49

List Question

A complicated sum of cosines involving sums inside the cosine arguments

Closed form expression for discrete-time sum of a cosinusoid

Trigonometric polynomails dense in $C(T)$ with period $1$ instead of $2\pi$

On the Fourier series expansion of $\sin(\pi x)$ periodic on $(-\frac{1}{2}, -\frac{1}{2})$

$f(x)=\sum_{k=0}^{n}\binom{n}{k}\sin^{k}x\sec^{k-n}{x}.$

Find the $Z$-transform of $\sin (\alpha k), k \ge0$

Series expansion of $x$ in terms of $\sin(\frac{x}{n})$

Is there any subsequence of the sequence $(\frac{\cos(\alpha - n \beta) - \lambda \cos(\alpha + n \beta)}{ \cos^n(\beta) })$ that converges?

Infinite Sum of an Inverse Trig Expression

Infinite sum of Spherical Bessel function and Cosine at odd index

Asymptotic average of cosine function

Evaluating the trace of two discrete Sine and Cosine transforms

Series of tan inverse x for x > 1

sums of imaginary exponentials

Integrating from $\int_0^\infty \frac{\sin(x)}x dx$ with year $10$ mathematics?

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