Question

Trigonometry: is there intuitive proof of $\sin(x + y)= \sin x\cos y+ \sin y\cos x$ when $x + y > 90^\circ$?

score 739 · Answer 1 · 2020-05-01 17:50:30

739

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Trigonometry: is there intuitive proof of $\sin(x + y)= \sin x\cos y+ \sin y\cos x$ when $x + y > 90^\circ$?

Published on 01 May 2020 - 17:50

score 104 · Answer 2 · 2026-03-26 09:37:04

104

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Finding the Green function for the TISE?

Published on 26 Mar 2026 - 9:37

score 39 · Answer 3 · 2020-05-02 13:08:17

39

Views

History of normal operator (matrix)

Published on 02 May 2020 - 13:08

score 458 · Answer 4 · 2026-03-26 11:18:33

458

Views

Is there visual or intuitive explanation of equations of conic sections defined in traditional way?

Published on 26 Mar 2026 - 11:18

score 206 · Answer 5 · 2020-05-05 07:45:56

206

Views

Number theory book to study

Published on 05 May 2020 - 7:45

score 19 · Answer 6 · 2020-05-05 16:17:10

19

Views

A bounded sequence with a diverting subsequence?

Published on 05 May 2020 - 16:17

score 44 · Answer 7 · 2026-03-26 23:04:43

44

Views

Sets, subsets and Cartesian product.

Published on 26 Mar 2026 - 23:04

score 48 · Answer 8 · 2020-05-08 11:45:03

48

Views

Synthetic proof of the equation of hyperbola

Published on 08 May 2020 - 11:45

score 223 · Answer 9 · 2020-05-10 23:37:42

223

Views

Find a and b given $(3x + 2)$ and $(x - 2)$ are factors of $6x^3 + ax^2 - 4ax + b$.

Published on 10 May 2020 - 23:37

score 10 · Answer 10 · 2020-05-11 18:30:09

10

Views

Should the approximation sign be carried forward in derivations involving multiple rearrangements?

Published on 11 May 2020 - 18:30

score 270 · Answer 11 · 2020-05-13 11:58:47

270

Views

Encounters with Zorn's lemma early in study of mathematics

Published on 13 May 2020 - 11:58

score 104 · Answer 12 · 2020-05-14 22:50:32

104

Views

A question about study methods

Published on 14 May 2020 - 22:50

score 344 · Answer 13 · 2020-05-15 06:41:25

344

Views

Intuition behind Heine definition of the limit of a function

Published on 15 May 2020 - 6:41

score 827 · Answer 14 · 2020-05-16 14:01:28

827

Views

What should I do when I get stuck?

Published on 16 May 2020 - 14:01

score 649 · Answer 15 · 2026-03-28 01:25:47

649

Views

Why does multiplication always have the associative and commutative property?

Published on 28 Mar 2026 - 1:25

List Question

Trigonometry: is there intuitive proof of $\sin(x + y)= \sin x\cos y+ \sin y\cos x$ when $x + y > 90^\circ$?

Finding the Green function for the TISE?

History of normal operator (matrix)

Is there visual or intuitive explanation of equations of conic sections defined in traditional way?

Number theory book to study

A bounded sequence with a diverting subsequence?

Sets, subsets and Cartesian product.

Synthetic proof of the equation of hyperbola

Find a and b given $(3x + 2)$ and $(x - 2)$ are factors of $6x^3 + ax^2 - 4ax + b$.

Should the approximation sign be carried forward in derivations involving multiple rearrangements?

Encounters with Zorn's lemma early in study of mathematics

A question about study methods

Intuition behind Heine definition of the limit of a function

What should I do when I get stuck?

Why does multiplication always have the associative and commutative property?

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