Question

Given two points with 3D coordinates, and three angle observations, how to caculate the coordinate of the third point

score 388 · Answer 1 · 2026-03-25 06:10:51

388

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Given two points with 3D coordinates, and three angle observations, how to caculate the coordinate of the third point

Published on 25 Mar 2026 - 6:10

score 1.2k · Answer 2 · 2026-04-12 20:27:05

1.2k

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Linearizing the trigonometric functions or: Squaring the circle by Fourier transformation

Published on 12 Apr 2026 - 20:27

score 212 · Answer 3 · 2026-04-17 09:04:09

212

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Prove that $a_1 \cos(b_1 x) + \dots + a_n \cos(b_n x)$ has zero

Published on 17 Apr 2026 - 9:04

score 62 · Answer 4 · 2026-04-17 03:14:55

62

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Why is this true? $\frac{x}{b}=cos(180 -\theta) \implies x=-b\ cos\ \theta$

Published on 17 Apr 2026 - 3:14

score 29 · Answer 5 · 2026-04-14 06:02:34

29

Views

Solving system of inequalities where individual variables already have constraints

Published on 14 Apr 2026 - 6:02

score 49 · Answer 6 · 2026-04-14 22:17:15

49

Views

What is the name of this type of related equation?

Published on 14 Apr 2026 - 22:17

score 159 · Answer 7 · 2026-04-17 13:16:44

159

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If $2(\sin a+\cos a)\sin b =3-\cos b$, then find $3\tan^2a+4\tan^2b$

Published on 17 Apr 2026 - 13:16

score 116 · Answer 8 · 2026-04-14 12:41:56

116

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How might I evaluate $\sum_{n=1}^{\infty}\frac{\sin(nx+c)}{n}$?

Published on 14 Apr 2026 - 12:41

score 70 · Answer 9 · 2026-04-12 03:17:00

70

Views

$ \arctan \sqrt 2 $ is not a rational multiple of $\pi $

Published on 12 Apr 2026 - 3:17

score 65 · Answer 10 · 2026-04-14 22:42:35

65

Views

Integers $n$ satsifying $\frac{1}{\sin \frac{3\pi}{n}}=\frac{1}{\sin \frac{5\pi}{n}}$

Published on 14 Apr 2026 - 22:42

score 50 · Answer 11 · 2026-04-12 14:33:38

50

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Working out angle between vectors?

Published on 12 Apr 2026 - 14:33

score 78 · Answer 12 · 2026-04-14 21:40:01

78

Views

Proof for $\frac{\cos^6 x}{\cos 6x}=1$

Published on 14 Apr 2026 - 21:40

score 342 · Answer 13 · 2026-04-15 18:33:57

342

Views

Show that $\lim_{n\to \infty} \int_E \cos^2(nx + a_n) dx = \frac{1}{2}m(E)$

Published on 15 Apr 2026 - 18:33

score 53 · Answer 14 · 2026-04-17 06:49:04

If $\csc\theta = \sqrt{\frac{p+q}{p-q}}$ where $p>q>0$, then $|\cot (\frac{\pi}{4} + \frac{\theta}{2})|$ is equal to

score 65 · Answer 15 · 2026-04-14 21:59:02

65

Views

length of hypotenuse where only part know

Published on 14 Apr 2026 - 21:59

List Question

Given two points with 3D coordinates, and three angle observations, how to caculate the coordinate of the third point

Linearizing the trigonometric functions or: Squaring the circle by Fourier transformation

Prove that $a_1 \cos(b_1 x) + \dots + a_n \cos(b_n x)$ has zero

Why is this true? $\frac{x}{b}=cos(180 -\theta) \implies x=-b\ cos\ \theta$

Solving system of inequalities where individual variables already have constraints

What is the name of this type of related equation?

If $2(\sin a+\cos a)\sin b =3-\cos b$, then find $3\tan^2a+4\tan^2b$

How might I evaluate $\sum_{n=1}^{\infty}\frac{\sin(nx+c)}{n}$?

$ \arctan \sqrt 2 $ is not a rational multiple of $\pi $

Integers $n$ satsifying $\frac{1}{\sin \frac{3\pi}{n}}=\frac{1}{\sin \frac{5\pi}{n}}$

Working out angle between vectors?

Proof for $\frac{\cos^6 x}{\cos 6x}=1$

Show that $\lim_{n\to \infty} \int_E \cos^2(nx + a_n) dx = \frac{1}{2}m(E)$

If $\csc\theta = \sqrt{\frac{p+q}{p-q}}$ where $p>q>0$, then $|\cot (\frac{\pi}{4} + \frac{\theta}{2})|$ is equal to

length of hypotenuse where only part know

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