Question

Approximate orthogonality between sine and cose

score 54 · Answer 1 · 2026-03-25 09:34:56

54

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Approximate orthogonality between sine and cose

Published on 25 Mar 2026 - 9:34

score 297 · Answer 2 · 2026-03-25 19:30:44

297

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Prove that $ \frac{\sin(2m+1) \theta}{\sin \theta} = 1 + 2 \cos2\theta + 2\cos4\theta+\dots+2 \cos2m\theta$

Published on 25 Mar 2026 - 19:30

score 285 · Answer 3 · 2018-02-27 00:26:46

285

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Help with $\cos(z)=3/2$

Published on 27 Feb 2018 - 0:26

score 59 · Answer 4 · 2018-02-27 02:42:28

59

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Full solution set of $\sin2\theta=-1$

Published on 27 Feb 2018 - 2:42

score 144 · Answer 5 · 2018-02-27 03:19:16

144

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Number of real $x$ satisfying the trigo equation $1+\sin 2x=\sin x+\sin^2 x$

Published on 27 Feb 2018 - 3:19

score 706 · Answer 6 · 2026-03-25 06:21:16

706

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How to determine the fundamental period of this discrete time function?

Published on 25 Mar 2026 - 6:21

score 162 · Answer 7 · 2026-03-23 18:43:44

162

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Why is the solution to this sum of two sines so complex?

Published on 23 Mar 2026 - 18:43

score 71 · Answer 8 · 2026-03-26 08:02:42

71

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Proof $1 \geq \prod_{k=m}^n\left\{ 1-\frac{\sin^2 \frac{x}{2n-1}}{\sin^2 \frac{k\pi}{2n-1}} \right\}$

Published on 26 Mar 2026 - 8:02

score 176 · Answer 9 · 2026-03-25 11:13:33

176

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A quirky proof for a limit of an integral

Published on 25 Mar 2026 - 11:13

score 147 · Answer 10 · 2018-02-27 12:39:58

147

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Integration Techniques (Trigo By Parts)

Published on 27 Feb 2018 - 12:39

score 47 · Answer 11 · 2018-02-27 17:15:03

47

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Another Quick Trig Question

Published on 27 Feb 2018 - 17:15

score 141 · Answer 12 · 2026-03-24 23:54:33

141

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What is so special about this number?

Published on 24 Mar 2026 - 23:54

score 277 · Answer 13 · 2018-02-27 18:37:42

277

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I need help solving: $\cos(4x)=\sin(2x)$

Published on 27 Feb 2018 - 18:37

score 1.3k · Answer 14 · 2018-02-27 19:51:43

1.3k

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How to calculate the angular frequency of a cosine wave and sine wave added together?

Published on 27 Feb 2018 - 19:51

score 77 · Answer 15 · 2026-03-25 17:42:14

77

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How can I relate the lengths in an analog watch and the angles in sexagesimal system?

Published on 25 Mar 2026 - 17:42

List Question

Approximate orthogonality between sine and cose

Prove that $ \frac{\sin(2m+1) \theta}{\sin \theta} = 1 + 2 \cos2\theta + 2\cos4\theta+\dots+2 \cos2m\theta$

Help with $\cos(z)=3/2$

Full solution set of $\sin2\theta=-1$

Number of real $x$ satisfying the trigo equation $1+\sin 2x=\sin x+\sin^2 x$

How to determine the fundamental period of this discrete time function?

Why is the solution to this sum of two sines so complex?

Proof $1 \geq \prod_{k=m}^n\left\{ 1-\frac{\sin^2 \frac{x}{2n-1}}{\sin^2 \frac{k\pi}{2n-1}} \right\}$

A quirky proof for a limit of an integral

Integration Techniques (Trigo By Parts)

Another Quick Trig Question

What is so special about this number?

I need help solving: $\cos(4x)=\sin(2x)$

How to calculate the angular frequency of a cosine wave and sine wave added together?

How can I relate the lengths in an analog watch and the angles in sexagesimal system?

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