Question

Is it possible to prove the following inequalities to be true?

score 64 · Answer 1 · 2026-03-25 03:03:10

Is it possible to prove the following inequalities to be true?

Published on 25 Mar 2026 - 3:03

score 69 · Answer 2 · 2018-11-15 02:36:46

Proving $\cos\frac{9}{11}\pi + \cos\frac{7}{11}\pi + \cos\frac{5}{11}\pi + \cos\frac{3}{11}\pi + \cos\frac{1}{11}\pi = \frac{1}{2}$

score 106 · Answer 3 · 2026-04-13 01:07:28

106

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Trig and Triangle Math Club Question: Finding Side Length

Published on 13 Apr 2026 - 1:07

score 55 · Answer 4 · 2018-11-15 13:25:19

Is there a way of reducing $4\sin(a)\sin(b)-\sin(a+c)\sin(b)-\sin(a)\sin(b+d)$ using the gonionmetric identities?

score 83 · Answer 5 · 2026-04-13 01:46:59

83

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How to evaluate $\int \sin^2 x \ dx$

Published on 13 Apr 2026 - 1:46

score 113 · Answer 6 · 2026-04-12 21:15:42

113

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Too many solutions to trig equation

Published on 12 Apr 2026 - 21:15

score 125 · Answer 7 · 2018-11-15 23:48:36

125

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Given a triangle with coners $A,B,C$, Show $\sin(A)+\sin(B)+\sin(C) \leq \frac{3\sqrt{3}}{2}$

Published on 15 Nov 2018 - 23:48

score 145 · Answer 8 · 2026-04-12 17:18:14

145

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Sine wave with different slope on each side

Published on 12 Apr 2026 - 17:18

score 93 · Answer 9 · 2018-11-16 17:53:12

93

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Evaluating trig limit $\lim\limits_{x\to 0}\frac{\sqrt{1-\cos(x^2)}}{1-\cos(x)}$

Published on 16 Nov 2018 - 17:53

score 141 · Answer 10 · 2026-04-12 18:54:12

141

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Calculate X, Y, Z of the 4 points in the 3D space.

Published on 12 Apr 2026 - 18:54

score 261 · Answer 11 · 2026-03-29 03:35:37

261

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Is $\cos(\frac x6) \cdot \cos( \frac {x \cdot \pi}{6})$ periodic?

Published on 29 Mar 2026 - 3:35

score 166 · Answer 12 · 2026-04-03 12:14:36

166

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If $z = cis(2k\pi/5)$, $z \neq 1$, then what is $(z+1/z)^2+(z^2 + 1/z^2)^2=$?

Published on 03 Apr 2026 - 12:14

score 396 · Answer 13 · 2026-03-28 01:13:36

396

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Circumradius of a perturbed equilateral triangle

Published on 28 Mar 2026 - 1:13

score 662 · Answer 14 · 2026-04-12 19:46:23

662

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Why does the derivative of $\sin^2x$ need the chain rule? Isn't it just $2\sin x$ by the power rule?

Published on 12 Apr 2026 - 19:46

score 311 · Answer 15 · 2026-04-07 20:06:14

311

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How do geometric properties of sine and cosine follow from their power series definition?

Published on 07 Apr 2026 - 20:06

List Question

Is it possible to prove the following inequalities to be true?

Proving $\cos\frac{9}{11}\pi + \cos\frac{7}{11}\pi + \cos\frac{5}{11}\pi + \cos\frac{3}{11}\pi + \cos\frac{1}{11}\pi = \frac{1}{2}$

Trig and Triangle Math Club Question: Finding Side Length

Is there a way of reducing $4\sin(a)\sin(b)-\sin(a+c)\sin(b)-\sin(a)\sin(b+d)$ using the gonionmetric identities?

How to evaluate $\int \sin^2 x \ dx$

Too many solutions to trig equation

Given a triangle with coners $A,B,C$, Show $\sin(A)+\sin(B)+\sin(C) \leq \frac{3\sqrt{3}}{2}$

Sine wave with different slope on each side

Evaluating trig limit $\lim\limits_{x\to 0}\frac{\sqrt{1-\cos(x^2)}}{1-\cos(x)}$

Calculate X, Y, Z of the 4 points in the 3D space.

Is $\cos(\frac x6) \cdot \cos( \frac {x \cdot \pi}{6})$ periodic?

If $z = cis(2k\pi/5)$, $z \neq 1$, then what is $(z+1/z)^2+(z^2 + 1/z^2)^2=$?

Circumradius of a perturbed equilateral triangle

Why does the derivative of $\sin^2x$ need the chain rule? Isn't it just $2\sin x$ by the power rule?

How do geometric properties of sine and cosine follow from their power series definition?

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