Question

Solve $y''+y=\cos^2(x)$ by variation of parameters

score 370 · Answer 1 · 2026-03-17 13:53:54

370

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Solve $y''+y=\cos^2(x)$ by variation of parameters

Published on 17 Mar 2026 - 13:53

score 1k · Answer 2 · 2026-03-29 22:30:18

1k

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Plot function y = tan(yx)

Published on 29 Mar 2026 - 22:30

score 289 · Answer 3 · 2018-01-17 09:05:28

289

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Limit of $\lim\limits_{n\to+\infty}\left(\cos\frac{x}{n} + \sin\frac{2x}{n}\right)^n $

Published on 17 Jan 2018 - 9:05

score 47 · Answer 4 · 2026-03-24 20:32:08

47

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How to show $\sec^{-1}(1+x) = O(x^{1/2})$ as $x\rightarrow 0$

Published on 24 Mar 2026 - 20:32

score 70 · Answer 5 · 2026-03-29 15:29:43

70

Views

Area of Triangle, Sine

Published on 29 Mar 2026 - 15:29

score 571 · Answer 6 · 2026-03-29 10:50:36

571

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If $\sqrt{9−8\cos 40^{\circ}} = a +b\sec 40^{\circ}$, then what is $|a+b|$?

Published on 29 Mar 2026 - 10:50

score 174 · Answer 7 · 2018-01-17 14:44:40

174

Views

How to compute $\lim\limits_{n\to\infty}\int_0^\pi \frac{\sin x}{1+3\cos^2(nx)}\text dx$

Published on 17 Jan 2018 - 14:44

score 815 · Answer 8 · 2026-03-29 11:04:06

815

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Simpler Derivation of $\sin \frac{\pi}{4} = \cos \frac{\pi}{4} = \frac{1}{\sqrt{2}}$,

Published on 29 Mar 2026 - 11:04

score 136 · Answer 9 · 2026-03-27 18:24:15

136

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Computing $\int_0^\pi \frac{dx}{1+a^2\cos^2(x)}$

Published on 27 Mar 2026 - 18:24

score 62 · Answer 10 · 2026-03-17 23:07:20

62

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Analytical solution for $\frac{e^{(2x + a)} - 1}{e^{(2x + a)}+1} = x$?

Published on 17 Mar 2026 - 23:07

score 841 · Answer 11 · 2018-01-18 04:48:25

841

Views

Generalized Harmonic Addition Theorem: $a \cos n x + b \sin m x = ???$ for $m\neq n$

Published on 18 Jan 2018 - 4:48

score 265 · Answer 12 · 2018-01-18 13:29:56

265

Views

Questions about an oscillation described by the equation $d=100+10\cos 500t^\circ$

Published on 18 Jan 2018 - 13:29

score 42 · Answer 13 · 2026-03-17 22:25:16

42

Views

Find number of solutions of the given equation in the specified interval

Published on 17 Mar 2026 - 22:25

score 1.5k · Answer 14 · 2026-03-24 20:32:03

1.5k

Views

Trigonometry: Finding the lengths of a right triangle

Published on 24 Mar 2026 - 20:32

score 605 · Answer 15 · 2026-03-25 05:50:17

605

Views

What is the precise value of the expression $\frac{\cos 25^{\circ}+\sin (-5^{\circ})}{\sin 25^{\circ}+\cos 5^{\circ}}$

Published on 25 Mar 2026 - 5:50

List Question

Solve $y''+y=\cos^2(x)$ by variation of parameters

Plot function y = tan(yx)

Limit of $\lim\limits_{n\to+\infty}\left(\cos\frac{x}{n} + \sin\frac{2x}{n}\right)^n $

How to show $\sec^{-1}(1+x) = O(x^{1/2})$ as $x\rightarrow 0$

Area of Triangle, Sine

If $\sqrt{9−8\cos 40^{\circ}} = a +b\sec 40^{\circ}$, then what is $|a+b|$?

How to compute $\lim\limits_{n\to\infty}\int_0^\pi \frac{\sin x}{1+3\cos^2(nx)}\text dx$

Simpler Derivation of $\sin \frac{\pi}{4} = \cos \frac{\pi}{4} = \frac{1}{\sqrt{2}}$,

Computing $\int_0^\pi \frac{dx}{1+a^2\cos^2(x)}$

Analytical solution for $\frac{e^{(2x + a)} - 1}{e^{(2x + a)}+1} = x$?

Generalized Harmonic Addition Theorem: $a \cos n x + b \sin m x = ???$ for $m\neq n$

Questions about an oscillation described by the equation $d=100+10\cos 500t^\circ$

Find number of solutions of the given equation in the specified interval

Trigonometry: Finding the lengths of a right triangle

What is the precise value of the expression $\frac{\cos 25^{\circ}+\sin (-5^{\circ})}{\sin 25^{\circ}+\cos 5^{\circ}}$

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