Question

Is there a trigonometric identity that implies the Riemann Hypothesis?

score 127 · Answer 1 · 2026-03-30 01:48:12

127

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Is there a trigonometric identity that implies the Riemann Hypothesis?

Published on 30 Mar 2026 - 1:48

score 954 · Answer 2 · 2026-03-29 15:29:47

954

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Finding the value of cot 142.5°

Published on 29 Mar 2026 - 15:29

score 116 · Answer 3 · 2026-03-29 20:45:06

Using trigonometric identities to simply the following expression $\tan\frac{\pi}{5} + 2\tan\frac{2\pi}{5}+ 4\cot\frac{4\pi}{5}=\cot\frac{\pi}{5}$

score 10.1k · Answer 4 · 2026-03-29 09:59:06

Derive the conditions $xy<1$ for $\tan^{-1}x+\tan^{-1}y=\tan^{-1}\frac{x+y}{1-xy}$ and $xy>-1$ for $\tan^{-1}x-\tan^{-1}y=\tan^{-1}\frac{x-y}{1+xy}$

score 84 · Answer 5 · 2026-03-29 13:57:19

84

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Sine of the sum of two solutions of $a\cos\theta + b \sin\theta = c$

Published on 29 Mar 2026 - 13:57

score 91 · Answer 6 · 2026-03-30 02:38:53

91

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Tan of difference of two angles given as sum of sines and cosines

Published on 30 Mar 2026 - 2:38

score 5.8k · Answer 7 · 2026-03-29 16:36:48

5.8k

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Limit of $\sqrt x \sin(1/x)$ where $x$ approaches positive infinity

Published on 29 Mar 2026 - 16:36

score 405 · Answer 8 · 2026-03-29 11:46:59

405

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$\int \ x\sqrt{1-x^2}\,dx$, by the substitution $x= \cos t$

Published on 29 Mar 2026 - 11:46

score 114 · Answer 9 · 2026-03-30 21:00:30

114

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Why are extraneous solutions created here?

Published on 30 Mar 2026 - 21:00

score 101 · Answer 10 · 2026-03-29 18:16:26

101

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I cannot solve this simple looking trigonometric question

Published on 29 Mar 2026 - 18:16

score 2k · Answer 11 · 2026-03-26 14:07:19

2k

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how to find values of x for which a triangle exists

Published on 26 Mar 2026 - 14:07

score 1.3k · Answer 12 · 2026-03-27 23:11:13

1.3k

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Solution of the trigonometric equation $\sin5x =\cos2x$

Published on 27 Mar 2026 - 23:11

score 43 · Answer 13 · 2026-03-24 03:45:23

43

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Help understanding a solution for a Calculus problem involving Trigonometry

Published on 24 Mar 2026 - 3:45

score 292 · Answer 14 · 2026-03-30 01:07:26

292

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Prove triangle ABC is equilateral triangle given that $2\sin A+3\sin B+4\sin C = 5\cos\frac{A}{2} + 3\cos\frac{B}{2} + \cos\frac{C}{2}$

Published on 30 Mar 2026 - 1:07

score 69 · Answer 15 · 2026-03-30 11:52:56

69

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Proving that a double integral converges

Published on 30 Mar 2026 - 11:52

List Question

Is there a trigonometric identity that implies the Riemann Hypothesis?

Finding the value of cot 142.5°

Using trigonometric identities to simply the following expression $\tan\frac{\pi}{5} + 2\tan\frac{2\pi}{5}+ 4\cot\frac{4\pi}{5}=\cot\frac{\pi}{5}$

Derive the conditions $xy<1$ for $\tan^{-1}x+\tan^{-1}y=\tan^{-1}\frac{x+y}{1-xy}$ and $xy>-1$ for $\tan^{-1}x-\tan^{-1}y=\tan^{-1}\frac{x-y}{1+xy}$

Sine of the sum of two solutions of $a\cos\theta + b \sin\theta = c$

Tan of difference of two angles given as sum of sines and cosines

Limit of $\sqrt x \sin(1/x)$ where $x$ approaches positive infinity

$\int \ x\sqrt{1-x^2}\,dx$, by the substitution $x= \cos t$

Why are extraneous solutions created here?

I cannot solve this simple looking trigonometric question

how to find values of x for which a triangle exists

Solution of the trigonometric equation $\sin5x =\cos2x$

Help understanding a solution for a Calculus problem involving Trigonometry

Prove triangle ABC is equilateral triangle given that $2\sin A+3\sin B+4\sin C = 5\cos\frac{A}{2} + 3\cos\frac{B}{2} + \cos\frac{C}{2}$

Proving that a double integral converges

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