Question

Are functions of the form $f(x)=A\sin(x)+B\cos(x)$ the only ones satisfying $f'(x)=f(x+\pi/2)$?

score 127 · Answer 1 · 2026-04-16 08:31:22

127

Views

Are functions of the form $f(x)=A\sin(x)+B\cos(x)$ the only ones satisfying $f'(x)=f(x+\pi/2)$?

Published on 16 Apr 2026 - 8:31

score 117 · Answer 2 · 2026-04-13 17:04:40

117

Views

Is there a simple term to describe the shape of 1 - |cos x|

Published on 13 Apr 2026 - 17:04

score 98 · Answer 3 · 2026-04-15 10:35:40

98

Views

How do we know from trig functions the length of a line segment? (like how we know sin$\theta = \sqrt2/2$ means length $1$)

Published on 15 Apr 2026 - 10:35

score 193 · Answer 4 · 2026-04-08 16:19:56

193

Views

Different Trigonometric Equations have different general solutions

Published on 08 Apr 2026 - 16:19

score 67 · Answer 5 · 2026-04-11 14:15:02

67

Views

Variation of Parameters Problem Using Nonstandard Constraint

Published on 11 Apr 2026 - 14:15

score 896 · Answer 6 · 2026-04-10 15:26:18

896

Views

How to locate an unknown point using the TDOA method of Trilateration

Published on 10 Apr 2026 - 15:26

score 89 · Answer 7 · 2026-04-15 22:20:06

89

Views

Solving $ \lim_{x\to0}{\frac{1}{x^2}-\cot^2(x)}$

Published on 15 Apr 2026 - 22:20

score 110 · Answer 8 · 2026-04-15 21:07:15

110

Views

There is a triangle, sides = a,b,c and its angle = $\alpha, \beta, \gamma$

Published on 15 Apr 2026 - 21:07

score 246 · Answer 9 · 2026-04-16 10:49:52

246

Views

Find the exact value of trigonometric expression: $ \arctan\frac{2\cos \frac{\pi}{30} \cos\frac{\pi}{15}}{1+2\cos \frac{\pi}{30} \sin\frac{\pi}{15}}$?

Published on 16 Apr 2026 - 10:49

score 33 · Answer 10 · 2026-04-16 11:18:11

33

Views

Question regarding trigonometric composite functions

Published on 16 Apr 2026 - 11:18

score 69 · Answer 11 · 2026-04-09 18:34:49

69

Views

what is $x$ for $\tan^23x = 2\sin^23x$

Published on 09 Apr 2026 - 18:34

score 327 · Answer 12 · 2026-04-13 21:31:55

327

Views

Find the exact value of $\sec \theta$ given the value of $\tan \theta$

Published on 13 Apr 2026 - 21:31

score 220 · Answer 13 · 2026-04-14 18:24:51

220

Views

Using $\sin5\theta=16\sin^5\theta-20\sin^3\theta+5\sin\theta$ to show that $w=\sin^2(\pi/5)$ satisfies $16w^2-20w+5=0$

Published on 14 Apr 2026 - 18:24

score 81 · Answer 14 · 2026-04-11 15:32:35

81

Views

Rotation question. Trigonometry equation.

Published on 11 Apr 2026 - 15:32

score 100 · Answer 15 · 2026-05-10 22:04:24

100

Views

Proof of $\sum_{n=1}^\infty \frac{\cos \ n}{n}=-\frac{\ln\left(2-2 \cos(1)\right)}{2} $

Published on 10 May 2026 - 22:04

List Question

Are functions of the form $f(x)=A\sin(x)+B\cos(x)$ the only ones satisfying $f'(x)=f(x+\pi/2)$?

Is there a simple term to describe the shape of 1 - |cos x|

How do we know from trig functions the length of a line segment? (like how we know sin$\theta = \sqrt2/2$ means length $1$)

Different Trigonometric Equations have different general solutions

Variation of Parameters Problem Using Nonstandard Constraint

How to locate an unknown point using the TDOA method of Trilateration

Solving $ \lim_{x\to0}{\frac{1}{x^2}-\cot^2(x)}$

There is a triangle, sides = a,b,c and its angle = $\alpha, \beta, \gamma$

Find the exact value of trigonometric expression: $ \arctan\frac{2\cos \frac{\pi}{30} \cos\frac{\pi}{15}}{1+2\cos \frac{\pi}{30} \sin\frac{\pi}{15}}$?

Question regarding trigonometric composite functions

what is $x$ for $\tan^23x = 2\sin^23x$

Find the exact value of $\sec \theta$ given the value of $\tan \theta$

Using $\sin5\theta=16\sin^5\theta-20\sin^3\theta+5\sin\theta$ to show that $w=\sin^2(\pi/5)$ satisfies $16w^2-20w+5=0$

Rotation question. Trigonometry equation.

Proof of $\sum_{n=1}^\infty \frac{\cos \ n}{n}=-\frac{\ln\left(2-2 \cos(1)\right)}{2} $

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