Question

Can I get $\cos(x)/\!\cos(y)$ if I have $\sin(x)/\!\sin(y)$?

score 52 · Answer 1 · 2018-10-08 08:34:39

52

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Can I get $\cos(x)/\!\cos(y)$ if I have $\sin(x)/\!\sin(y)$?

Published on 08 Oct 2018 - 8:34

score 117 · Answer 2 · 2026-04-09 18:11:13

117

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How to remove discontinuity from the equation?

Published on 09 Apr 2026 - 18:11

score 3.8k · Answer 3 · 2026-04-11 09:04:29

3.8k

Views

Understanding sine, cosine, and tangent in the unit circle

Published on 11 Apr 2026 - 9:04

score 65 · Answer 4 · 2026-04-11 18:42:44

65

Views

Trigonometry problem concerning a point outside an isosceles triangle

Published on 11 Apr 2026 - 18:42

score 92 · Answer 5 · 2026-03-25 20:53:28

92

Views

Proof of inequality $|x \sin \alpha + y \cos \alpha| \leq \sqrt{x^2 + y^2}$

Published on 25 Mar 2026 - 20:53

score 200 · Answer 6 · 2026-03-25 21:01:35

200

Views

Is it possible to solve $\cos(x) + 2e^{x} = 0$ analytically?

Published on 25 Mar 2026 - 21:01

score 5.7k · Answer 7 · 2018-10-08 22:09:29

5.7k

Views

why is $\cos^2(\theta) + \sin^2(\theta)$ always approximately $1$

Published on 08 Oct 2018 - 22:09

score 469 · Answer 8 · 2026-04-08 18:44:26

469

Views

Is there an analytic solution for such problem?

Published on 08 Apr 2026 - 18:44

score 3.1k · Answer 9 · 2026-04-06 05:02:46

3.1k

Views

Why is this length $r d\theta$?

Published on 06 Apr 2026 - 5:02

score 95 · Answer 10 · 2026-04-11 18:52:56

95

Views

What can I do with a polynomial of cosines?

Published on 11 Apr 2026 - 18:52

score 1.9k · Answer 11 · 2018-10-09 10:53:59

1.9k

Views

Does $\sum_{n=1}^\infty \frac{\cos{(\sqrt{n})}}{n}$ converge?

Published on 09 Oct 2018 - 10:53

score 296 · Answer 12 · 2026-03-25 15:54:43

296

Views

Proof maximal area of a n-polygon with Lagrange multipliers

Published on 25 Mar 2026 - 15:54

score 89 · Answer 13 · 2026-03-31 08:43:41

89

Views

limiting ratio of two triangle areas

Published on 31 Mar 2026 - 8:43

score 321 · Answer 14 · 2018-10-09 19:01:39

321

Views

If $x_n = \cos{\sqrt{n + 1}} - \cos{\sqrt{n}}$, what is $\lim_{x \to \infty} x_n$?

Published on 09 Oct 2018 - 19:01

score 2.1k · Answer 15 · 2026-03-26 14:18:47

2.1k

Views

Why is $\arcsin(x) = \pi$ an impossible equation?

Published on 26 Mar 2026 - 14:18

List Question

Can I get $\cos(x)/\!\cos(y)$ if I have $\sin(x)/\!\sin(y)$?

How to remove discontinuity from the equation?

Understanding sine, cosine, and tangent in the unit circle

Trigonometry problem concerning a point outside an isosceles triangle

Proof of inequality $|x \sin \alpha + y \cos \alpha| \leq \sqrt{x^2 + y^2}$

Is it possible to solve $\cos(x) + 2e^{x} = 0$ analytically?

why is $\cos^2(\theta) + \sin^2(\theta)$ always approximately $1$

Is there an analytic solution for such problem?

Why is this length $r d\theta$?

What can I do with a polynomial of cosines?

Does $\sum_{n=1}^\infty \frac{\cos{(\sqrt{n})}}{n}$ converge?

Proof maximal area of a n-polygon with Lagrange multipliers

limiting ratio of two triangle areas

If $x_n = \cos{\sqrt{n + 1}} - \cos{\sqrt{n}}$, what is $\lim_{x \to \infty} x_n$?

Why is $\arcsin(x) = \pi$ an impossible equation?

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