Question

What would the law of the tangents be for a tetrahedron?

score 35 · Answer 1 · 2026-04-11 19:18:39

35

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What would the law of the tangents be for a tetrahedron?

Published on 11 Apr 2026 - 19:18

score 33 · Answer 2 · 2026-04-16 02:28:09

33

Views

A puzzle about replacing $v_1$, $v_2$, $v_3$ while retaining the linear independence of the resulting set.

Published on 16 Apr 2026 - 2:28

score 24 · Answer 3 · 2026-04-15 19:08:46

24

Views

Proving $\sum_{j=0}^{N-1}\cos\frac{\left(2j+1\right)\pi}{2N}=0$

Published on 15 Apr 2026 - 19:08

score 641 · Answer 4 · 2026-04-15 04:34:25

641

Views

Inverse of $\frac{\sin(x)}{x}$

Published on 15 Apr 2026 - 4:34

score 331 · Answer 5 · 2026-04-12 11:54:51

331

Views

Find the median in a triangle with trigonometry

Published on 12 Apr 2026 - 11:54

score 130 · Answer 6 · 2026-04-16 08:33:54

Find $\tan \left(\frac{\theta}{2}\right)$, given $\sin (\theta) = \frac 35$, with $90^\circ < \theta < 180^\circ$

score 760 · Answer 7 · 2026-04-15 19:53:59

760

Views

Find $\sin(\frac{x}{2})$, given $\tan(x) = 2$, with $0 < x < \frac{\pi}{2}$.

Published on 15 Apr 2026 - 19:53

score 60 · Answer 8 · 2026-04-12 08:10:12

60

Views

Solving Trigonometric Questions Without a Calculator

Published on 12 Apr 2026 - 8:10

score 178 · Answer 9 · 2026-04-14 23:14:25

178

Views

Simplifying $\prod_{k=3}^{n-1}\cos\left(\frac{\pi}{k}\right)$

Published on 14 Apr 2026 - 23:14

score 850 · Answer 10 · 2026-04-12 01:30:58

850

Views

How to find the center of an after-rotated rectangle in 2d-space?

Published on 12 Apr 2026 - 1:30

score 59 · Answer 11 · 2026-04-16 10:59:49

59

Views

Is $\tan^{-1}(-1) = 3\pi /4$ or $=7\pi /4$? I understand they're both valid solutions, but what about places where the value is added/subtracted?

Published on 16 Apr 2026 - 10:59

score 333 · Answer 12 · 2026-04-14 04:40:37

333

Views

Trigonometry: Model of snowfall

Published on 14 Apr 2026 - 4:40

score 1k · Answer 13 · 2026-04-10 21:06:56

1k

Views

Two possible angles in a triangle

Published on 10 Apr 2026 - 21:06

score 47 · Answer 14 · 2026-04-14 02:37:26

47

Views

Circumference touching a sine wave

Published on 14 Apr 2026 - 2:37

score 6.2k · Answer 15 · 2026-04-12 08:04:31

6.2k

Views

Why are the trig functions versine, haversine, exsecant, etc, rarely used in modern mathematics?

Published on 12 Apr 2026 - 8:04

List Question

What would the law of the tangents be for a tetrahedron?

A puzzle about replacing $v_1$, $v_2$, $v_3$ while retaining the linear independence of the resulting set.

Proving $\sum_{j=0}^{N-1}\cos\frac{\left(2j+1\right)\pi}{2N}=0$

Inverse of $\frac{\sin(x)}{x}$

Find the median in a triangle with trigonometry

Find $\tan \left(\frac{\theta}{2}\right)$, given $\sin (\theta) = \frac 35$, with $90^\circ < \theta < 180^\circ$

Find $\sin(\frac{x}{2})$, given $\tan(x) = 2$, with $0 < x < \frac{\pi}{2}$.

Solving Trigonometric Questions Without a Calculator

Simplifying $\prod_{k=3}^{n-1}\cos\left(\frac{\pi}{k}\right)$

How to find the center of an after-rotated rectangle in 2d-space?

Is $\tan^{-1}(-1) = 3\pi /4$ or $=7\pi /4$? I understand they're both valid solutions, but what about places where the value is added/subtracted?

Trigonometry: Model of snowfall

Two possible angles in a triangle

Circumference touching a sine wave

Why are the trig functions versine, haversine, exsecant, etc, rarely used in modern mathematics?

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