Question

computes the $\phi$ angle of an ellipse

score 105 · Answer 1 · 2026-03-26 14:25:26

105

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computes the $\phi$ angle of an ellipse

Published on 26 Mar 2026 - 14:25

score 432 · Answer 2 · 2026-04-11 17:29:55

432

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How to use double angle identities to find length 'd'?

Published on 11 Apr 2026 - 17:29

score 281 · Answer 3 · 2026-04-14 08:59:19

281

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Calculate $\sin\frac{\pi}{16}$ from given trigonometric identities

Published on 14 Apr 2026 - 8:59

score 88 · Answer 4 · 2026-04-13 16:11:33

88

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Prove $\sin^{-1}(1)\geq \int_0^b1/\sqrt{1-x^2}dx +(1-b)\pi/2$ for $b \in [0,1)$

Published on 13 Apr 2026 - 16:11

score 188 · Answer 5 · 2026-03-26 13:02:42

188

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Find the value of $3\tan^{-1}\frac{1}{2}+2\tan^{-1}\frac{1}{5}+\sin^{-1}\frac{142}{65\sqrt{5}}$

Published on 26 Mar 2026 - 13:02

score 570 · Answer 6 · 2026-03-28 11:42:45

570

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Why is 2 $\cdot$ $\sin(\alpha)$ $\cos(\alpha)$=$\sin(2\alpha)$?

Published on 28 Mar 2026 - 11:42

score 102 · Answer 7 · 2026-04-14 04:12:57

102

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How to draw $\sin(x^2)$?

Published on 14 Apr 2026 - 4:12

score 127 · Answer 8 · 2018-12-12 05:26:44

Let $f(x)=\cos \left[\cot ^{-1}\left( \frac{\cos x}{\sqrt{1-\cos 2x}}\right)\right]$ where $\frac{\pi}4<x<\frac{\pi}2$. Find $\frac{df(x)}{d\cot(x)}$

score 276 · Answer 9 · 2018-12-12 14:47:15

276

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Losing solutions in $\cos{x}+\cos{2x}=0$

Published on 12 Dec 2018 - 14:47

score 2.1k · Answer 10 · 2018-12-12 16:37:01

2.1k

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Find $\lim_{n\to\infty} \cos(\frac{\pi}{4}) \cos(\frac{\pi}{8})\ldots \cos(\frac{\pi}{2^n}) $

Published on 12 Dec 2018 - 16:37

score 151 · Answer 11 · 2026-04-14 18:45:27

151

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Another interesting way to evaluating the integral $\int \frac{\cos(x)}{a+b \cos(x)}\:dx$

Published on 14 Apr 2026 - 18:45

score 76 · Answer 12 · 2026-04-12 13:43:11

76

Views

Compare two fractions

Published on 12 Apr 2026 - 13:43

score 377 · Answer 13 · 2026-04-14 06:11:27

377

Views

Snub cube's angles

Published on 14 Apr 2026 - 6:11

score 119 · Answer 14 · 2026-04-10 15:56:37

119

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Why the angle is $-180°$ at $\omega = 0$ for this system

Published on 10 Apr 2026 - 15:56

score 71 · Answer 15 · 2026-03-26 22:16:10

71

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Why $\int_0^{2\pi} \sin^2 x \mathrm{d}x \neq \int_0^{2\pi}\sin x \sin nx \mathrm{d}x \to n=1$

Published on 26 Mar 2026 - 22:16

List Question

computes the $\phi$ angle of an ellipse

How to use double angle identities to find length 'd'?

Calculate $\sin\frac{\pi}{16}$ from given trigonometric identities

Prove $\sin^{-1}(1)\geq \int_0^b1/\sqrt{1-x^2}dx +(1-b)\pi/2$ for $b \in [0,1)$

Find the value of $3\tan^{-1}\frac{1}{2}+2\tan^{-1}\frac{1}{5}+\sin^{-1}\frac{142}{65\sqrt{5}}$

Why is 2 $\cdot$ $\sin(\alpha)$ $\cos(\alpha)$=$\sin(2\alpha)$?

How to draw $\sin(x^2)$?

Let $f(x)=\cos \left[\cot ^{-1}\left( \frac{\cos x}{\sqrt{1-\cos 2x}}\right)\right]$ where $\frac{\pi}4<x<\frac{\pi}2$. Find $\frac{df(x)}{d\cot(x)}$

Losing solutions in $\cos{x}+\cos{2x}=0$

Find $\lim_{n\to\infty} \cos(\frac{\pi}{4}) \cos(\frac{\pi}{8})\ldots \cos(\frac{\pi}{2^n}) $

Another interesting way to evaluating the integral $\int \frac{\cos(x)}{a+b \cos(x)}\:dx$

Compare two fractions

Snub cube's angles

Why the angle is $-180°$ at $\omega = 0$ for this system

Why $\int_0^{2\pi} \sin^2 x \mathrm{d}x \neq \int_0^{2\pi}\sin x \sin nx \mathrm{d}x \to n=1$

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