Question

Why does the use of the sign function work in this rotation formula?

score 74 · Answer 1 · 2026-04-16 14:53:05

74

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Why does the use of the sign function work in this rotation formula?

Published on 16 Apr 2026 - 14:53

score 63 · Answer 2 · 2026-04-14 06:42:21

63

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How do I show that the line $lx+my+1=0$ touches a fixed circle, provided $l^2-5m^2+6l+1=0$?

Published on 14 Apr 2026 - 6:42

score 161 · Answer 3 · 2026-04-09 08:06:49

161

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Equation of a section plane in hyperbolic paraboloid

Published on 09 Apr 2026 - 8:06

score 153 · Answer 4 · 2026-04-11 05:54:40

153

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Plane section in hyperboloid

Published on 11 Apr 2026 - 5:54

score 269 · Answer 5 · 2026-05-05 20:57:33

269

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Eliminate $t$ from $h=\frac{3t^2-4t+1}{t^2+1}, k=\frac{4-2t}{t^2+1}$

Published on 05 May 2026 - 20:57

score 175 · Answer 6 · 2026-04-14 05:16:35

175

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In-center of a triangle

Published on 14 Apr 2026 - 5:16

score 202 · Answer 7 · 2026-03-26 13:46:34

202

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Is there a parametrization of a hyperbola $x^2-y^2=1$ by functions x(t) and y(t) both birational?

Published on 26 Mar 2026 - 13:46

score 189 · Answer 8 · 2026-04-14 13:46:23

189

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Can there be a single equation for more than one equilateral polygon with the origin set at zero?

Published on 14 Apr 2026 - 13:46

score 700 · Answer 9 · 2026-04-12 16:27:44

700

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Determinant formula for coordinates of circumcenter and orthocenter of a triangle

Published on 12 Apr 2026 - 16:27

score 274 · Answer 10 · 2026-04-08 21:32:11

274

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What is the relationship between projection plane and projective plane?

Published on 08 Apr 2026 - 21:32

score 574 · Answer 11 · 2026-04-10 04:34:13

574

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What is the expression of mean curvature on a torus?

Published on 10 Apr 2026 - 4:34

score 494 · Answer 12 · 2026-04-11 00:39:25

494

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Given multiple coordinates (x,y) of a vehicle, how to determine the angle at which the vehicle turns?

Published on 11 Apr 2026 - 0:39

score 279 · Answer 13 · 2026-04-13 23:35:18

279

Views

Given two distinct intersecting circles, length of that chord of larger circle which is bisected by the smaller circle is equal to?

Published on 13 Apr 2026 - 23:35

score 63 · Answer 14 · 2026-04-11 21:23:05

63

Views

3D projection of a hyperellispoid in 6D

Published on 11 Apr 2026 - 21:23

score 64 · Answer 15 · 2026-04-13 22:40:26

Consider a three points M1,M2 and M3 that are not on the same line.Write the equation of the line L1 passing through the points M1 and M2.

List Question

Why does the use of the sign function work in this rotation formula?

How do I show that the line $lx+my+1=0$ touches a fixed circle, provided $l^2-5m^2+6l+1=0$?

Equation of a section plane in hyperbolic paraboloid

Plane section in hyperboloid

Eliminate $t$ from $h=\frac{3t^2-4t+1}{t^2+1}, k=\frac{4-2t}{t^2+1}$

In-center of a triangle

Is there a parametrization of a hyperbola $x^2-y^2=1$ by functions x(t) and y(t) both birational?

Can there be a single equation for more than one equilateral polygon with the origin set at zero?

Determinant formula for coordinates of circumcenter and orthocenter of a triangle

What is the relationship between projection plane and projective plane?

What is the expression of mean curvature on a torus?

Given multiple coordinates (x,y) of a vehicle, how to determine the angle at which the vehicle turns?

Given two distinct intersecting circles, length of that chord of larger circle which is bisected by the smaller circle is equal to?

3D projection of a hyperellispoid in 6D

Consider a three points M1,M2 and M3 that are not on the same line.Write the equation of the line L1 passing through the points M1 and M2.

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