Question

Parabolic mirror: why is $b^2-1/4 = \tan(2\tan^{-1}(2b)+{\pi}/{2})(b-0)$ for all $b$?

score 55 · Answer 1 · 2019-09-23 21:21:46

55

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Parabolic mirror: why is $b^2-1/4 = \tan(2\tan^{-1}(2b)+{\pi}/{2})(b-0)$ for all $b$?

Published on 23 Sep 2019 - 21:21

score 72 · Answer 2 · 2026-03-25 22:23:54

72

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Using an isometry to convert a conic section to standard form

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score 90 · Answer 3 · 2026-03-29 18:33:32

90

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score 454 · Answer 4 · 2026-03-28 14:55:04

454

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Published on 28 Mar 2026 - 14:55

score 733 · Answer 5 · 2026-03-25 06:11:05

733

Views

How to solve this system of hyperbola equations?

Published on 25 Mar 2026 - 6:11

score 109 · Answer 6 · 2019-09-29 01:13:49

109

Views

IS There a proof that if 4 points on a parabola have x coordinates summing to 0 then there is a circle that contains them all?

Published on 29 Sep 2019 - 1:13

score 1.3k · Answer 7 · 2026-03-27 20:30:45

1.3k

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Parametric Equations For A True Egg-shape

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score 51 · Answer 8 · 2026-03-28 11:42:11

51

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score 273 · Answer 9 · 2014-03-12 03:42:07

273

Views

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score 5.5k · Answer 10 · 2026-03-26 03:11:17

5.5k

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Graphing an ellipse on TI-nspire CX CAS

Published on 26 Mar 2026 - 3:11

score 2.1k · Answer 11 · 2026-03-27 17:34:06

2.1k

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What is wrong with this method for a rotated and shifted parabola?

Published on 27 Mar 2026 - 17:34

score 67 · Answer 12 · 2014-03-13 21:55:20

67

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Published on 13 Mar 2014 - 21:55

score 472 · Answer 13 · 2014-03-20 03:06:36

472

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score 22.9k · Answer 14 · 2014-03-21 13:47:46

22.9k

Views

Why does the "T=0" method to calculate tangent work?

Published on 21 Mar 2014 - 13:47

score 1.7k · Answer 15 · 2014-03-24 01:29:04

1.7k

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Area of circle formed when sphere is sliced by a plane

Published on 24 Mar 2014 - 1:29

List Question

Parabolic mirror: why is $b^2-1/4 = \tan(2\tan^{-1}(2b)+{\pi}/{2})(b-0)$ for all $b$?

Using an isometry to convert a conic section to standard form

Equation to determine if a natural number is a prime, not a prime, summation or power of 2

How many points are needed to uniquely define an ellipsoid centered on the origin?

How to solve this system of hyperbola equations?

IS There a proof that if 4 points on a parabola have x coordinates summing to 0 then there is a circle that contains them all?

Parametric Equations For A True Egg-shape

Proof for defining a unique ellipsoid

Conic Sections - Why do I need to know all these terms (foci, latus rectum, directrix, etc)? When will I use them?

Graphing an ellipse on TI-nspire CX CAS

What is wrong with this method for a rotated and shifted parabola?

Number of ellipses to uniquely define a co-centered circumscribing ellipse

Show that the intersection of a plane...

Why does the "T=0" method to calculate tangent work?

Area of circle formed when sphere is sliced by a plane

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