Question

Efficiently finding $\theta$ such that $\cos\theta = -\frac12$ and $\sin\theta = \frac{\sqrt{3}}{2}$. I know the quadrant, but what are the angles?

score 505 · Answer 1 · 2026-04-13 09:29:15

Efficiently finding $\theta$ such that $\cos\theta = -\frac12$ and $\sin\theta = \frac{\sqrt{3}}{2}$. I know the quadrant, but what are the angles?

score 574 · Answer 2 · 2026-04-13 14:59:46

574

Views

General solution of $\sin 2x+\cos x=0$

Published on 13 Apr 2026 - 14:59

score 102 · Answer 3 · 2026-04-09 21:38:47

102

Views

How do I find the $y$ in $y^{\sin x} = x^{\sin y}$?

Published on 09 Apr 2026 - 21:38

score 29 · Answer 4 · 2018-11-26 02:57:17

29

Views

Angle between vector and axis

Published on 26 Nov 2018 - 2:57

score 95 · Answer 5 · 2026-04-11 01:10:06

95

Views

2D Coordinate - Given two lines and their angles, compute the point in which the perpendicular foot length becomes h

Published on 11 Apr 2026 - 1:10

score 123 · Answer 6 · 2026-04-12 18:30:32

123

Views

2D Coordinate - find the length of perpendicular foot on tilted system

Published on 12 Apr 2026 - 18:30

score 171 · Answer 7 · 2026-04-11 16:56:09

171

Views

A faster solution to this equation: $e^{-ix}(1+e^{-ix}) = -1$

Published on 11 Apr 2026 - 16:56

score 27 · Answer 8 · 2026-04-11 14:34:05

27

Views

2D Coordinate - Plot a line parallel to another line

Published on 11 Apr 2026 - 14:34

score 121 · Answer 9 · 2026-03-28 00:49:34

121

Views

Does $\cos\left(\frac{2\pi}2\right) = 0$?

Published on 28 Mar 2026 - 0:49

score 98 · Answer 10 · 2018-11-26 16:00:04

98

Views

Find the derivative of $y={1\over2}\tan^4x-{1\over2}\tan^2x-\ln\cos x$

Published on 26 Nov 2018 - 16:00

score 84 · Answer 11 · 2026-04-13 04:45:15

84

Views

How to Determine Cosine, and Sine Given $\tan^{-1}x$

Published on 13 Apr 2026 - 4:45

score 1.3k · Answer 12 · 2026-04-12 19:25:37

1.3k

Views

Using the Law of Cosines results in an "invalid" answer, why?

Published on 12 Apr 2026 - 19:25

score 100 · Answer 13 · 2018-11-26 23:13:25

100

Views

approximation of trigonometric functions in form $a + bx + cx^2 +...$

Published on 26 Nov 2018 - 23:13

score 44 · Answer 14 · 2026-04-13 08:19:32

44

Views

Is there a way to find $\cos(a+b)$ and $\cos(a-b)$ in terms of $\tan a$ and $\tan b$?

Published on 13 Apr 2026 - 8:19

score 115 · Answer 15 · 2026-04-01 15:45:31

115

Views

Real solution of $(\cos x -\sin x)\cdot \bigg(2\tan x+\frac{1}{\cos x}\bigg)+2=0.$

Published on 01 Apr 2026 - 15:45

List Question

Efficiently finding $\theta$ such that $\cos\theta = -\frac12$ and $\sin\theta = \frac{\sqrt{3}}{2}$. I know the quadrant, but what are the angles?

General solution of $\sin 2x+\cos x=0$

How do I find the $y$ in $y^{\sin x} = x^{\sin y}$?

Angle between vector and axis

2D Coordinate - Given two lines and their angles, compute the point in which the perpendicular foot length becomes h

2D Coordinate - find the length of perpendicular foot on tilted system

A faster solution to this equation: $e^{-ix}(1+e^{-ix}) = -1$

2D Coordinate - Plot a line parallel to another line

Does $\cos\left(\frac{2\pi}2\right) = 0$?

Find the derivative of $y={1\over2}\tan^4x-{1\over2}\tan^2x-\ln\cos x$

How to Determine Cosine, and Sine Given $\tan^{-1}x$

Using the Law of Cosines results in an "invalid" answer, why?

approximation of trigonometric functions in form $a + bx + cx^2 +...$

Is there a way to find $\cos(a+b)$ and $\cos(a-b)$ in terms of $\tan a$ and $\tan b$?

Real solution of $(\cos x -\sin x)\cdot \bigg(2\tan x+\frac{1}{\cos x}\bigg)+2=0.$

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