Question

How is $\overline{c_{\epsilon}}:=\overline{\bigcup_{n\geq 1}\left(\bigcap_{k=n}^{\infty}B(x_k,r+\epsilon)\cap K \right)}$ convex in a CAT$(0)$ space?

score 179 · Answer 1 · 2026-04-17 05:54:05

179

Views

How is $\overline{c_{\epsilon}}:=\overline{\bigcup_{n\geq 1}\left(\bigcap_{k=n}^{\infty}B(x_k,r+\epsilon)\cap K \right)}$ convex in a CAT$(0)$ space?

Published on 17 Apr 2026 - 5:54

score 795 · Answer 2 · 2026-04-14 13:16:21

795

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Solve for x $ \sin 30° \sin x \sin 10° = \sin 20° \sin ({80°-x}) \sin 40° $

Published on 14 Apr 2026 - 13:16

score 166 · Answer 3 · 2026-04-14 03:32:39

166

Views

Solve this equation $\cos{\left(\frac{\pi}{3}-\frac{\pi}{3r}\right)}=\sqrt{\frac{11}{r^2}-2}$

Published on 14 Apr 2026 - 3:32

score 107 · Answer 4 · 2026-04-12 01:38:51

107

Views

Using mathematical induction to prove products of trigonometric function

Published on 12 Apr 2026 - 1:38

score 55 · Answer 5 · 2026-04-17 05:32:41

55

Views

$S=\left \{z\in\mathbb{C}| (z+i)^{n}=(z-i)^{n} \right \}$ $S=?$

Published on 17 Apr 2026 - 5:32

score 79 · Answer 6 · 2026-04-16 19:53:22

79

Views

Definitions of sin and cos using the exponent

Published on 16 Apr 2026 - 19:53

score 294 · Answer 7 · 2026-04-17 01:47:19

294

Views

What is the range of $ y = (\operatorname{arccot} x) (\operatorname{ arccot} ( - x)) $

Published on 17 Apr 2026 - 1:47

score 48 · Answer 8 · 2026-04-15 18:46:15

48

Views

Solving $2\sin(x) + 3\sin(2x) = 0$

Published on 15 Apr 2026 - 18:46

score 555 · Answer 9 · 2026-04-14 19:30:11

555

Views

Solving $\sin(6x) + \sin(4x) = 0$

Published on 14 Apr 2026 - 19:30

score 81 · Answer 10 · 2026-04-16 07:20:41

81

Views

Solving $\sin(x)=\cos(2x)$

Published on 16 Apr 2026 - 7:20

score 126 · Answer 11 · 2026-03-25 06:10:39

126

Views

Does $180i = \pi(i)$ through euler's identity by $e^{90i} = 0 + i$

Published on 25 Mar 2026 - 6:10

score 561 · Answer 12 · 2026-04-15 10:58:27

561

Views

Find all pairs $(x, y)$ with $x, y$ real, satisfying the equations: $\sin\frac{(x+y)}2=0$ & $|x| + |y| = 1$

Published on 15 Apr 2026 - 10:58

score 245 · Answer 13 · 2026-04-14 10:39:42

245

Views

ABC triangle with $\tan\left(\frac{A}{2}\right)=\frac{a}{b+c}$

Published on 14 Apr 2026 - 10:39

score 1k · Answer 14 · 2026-04-14 15:24:45

1k

Views

Find the diameter of a circle subtended by an angle

Published on 14 Apr 2026 - 15:24

score 202 · Answer 15 · 2026-04-11 06:33:25

202

Views

Is there any formula for $\arctan x + \arctan y + \arctan z$?

Published on 11 Apr 2026 - 6:33

List Question

How is $\overline{c_{\epsilon}}:=\overline{\bigcup_{n\geq 1}\left(\bigcap_{k=n}^{\infty}B(x_k,r+\epsilon)\cap K \right)}$ convex in a CAT$(0)$ space?

Solve for x $ \sin 30° \sin x \sin 10° = \sin 20° \sin ({80°-x}) \sin 40° $

Solve this equation $\cos{\left(\frac{\pi}{3}-\frac{\pi}{3r}\right)}=\sqrt{\frac{11}{r^2}-2}$

Using mathematical induction to prove products of trigonometric function

$S=\left \{z\in\mathbb{C}| (z+i)^{n}=(z-i)^{n} \right \}$ $S=?$

Definitions of sin and cos using the exponent

What is the range of $ y = (\operatorname{arccot} x) (\operatorname{ arccot} ( - x)) $

Solving $2\sin(x) + 3\sin(2x) = 0$

Solving $\sin(6x) + \sin(4x) = 0$

Solving $\sin(x)=\cos(2x)$

Does $180i = \pi(i)$ through euler's identity by $e^{90i} = 0 + i$

Find all pairs $(x, y)$ with $x, y$ real, satisfying the equations: $\sin\frac{(x+y)}2=0$ & $|x| + |y| = 1$

ABC triangle with $\tan\left(\frac{A}{2}\right)=\frac{a}{b+c}$

Find the diameter of a circle subtended by an angle

Is there any formula for $\arctan x + \arctan y + \arctan z$?

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