Question

prove that $\tan2x=\frac{2\sin x\cos x}{1-2\sin^2x}$

score 407 · Answer 1 · 2018-04-30 12:05:17

407

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prove that $\tan2x=\frac{2\sin x\cos x}{1-2\sin^2x}$

Published on 30 Apr 2018 - 12:05

score 1.3k · Answer 2 · 2018-04-30 13:32:41

1.3k

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Calculating length of AD

Published on 30 Apr 2018 - 13:32

score 54 · Answer 3 · 2018-04-30 15:46:16

54

Views

Certain types of tangent values

Published on 30 Apr 2018 - 15:46

score 47 · Answer 4 · 2018-04-30 17:45:12

47

Views

Find the $\theta$ of $\frac{a}{\cos\theta}+\frac{b}{\sin\theta}=c$

Published on 30 Apr 2018 - 17:45

score 1.3k · Answer 5 · 2026-03-26 12:53:06

1.3k

Views

Max area: Quadrilateral with fixed perimeter and interior angle

Published on 26 Mar 2026 - 12:53

score 37 · Answer 6 · 2018-05-01 02:31:36

37

Views

How would I constantly position a point above a ray?

Published on 01 May 2018 - 2:31

score 214 · Answer 7 · 2026-03-27 14:52:42

214

Views

About the relation $\tan^{-1} x= 2\tan^{-1}\left(x+\sqrt{1+x^2}\right)-\frac\pi2$

Published on 27 Mar 2026 - 14:52

score 28 · Answer 8 · 2026-03-25 04:40:52

28

Views

Can the hyperbolic cotangent be defined in terms of the projection of an intersection?

Published on 25 Mar 2026 - 4:40

score 93 · Answer 9 · 2018-05-01 12:14:33

93

Views

Find the general value of $x$ satisfying $\sin x=\frac{1}{2}$ and $\cos x=-\frac{\sqrt {3}}{2}$

Published on 01 May 2018 - 12:14

score 138 · Answer 10 · 2026-03-25 01:18:41

138

Views

How can we calculate the sum of sines or cosines where the angles are in geometric progression?

Published on 25 Mar 2026 - 1:18

score 224 · Answer 11 · 2026-03-25 10:12:47

224

Views

Determine relative coordinates of a point inside a triangle with only distances known

Published on 25 Mar 2026 - 10:12

score 1.4k · Answer 12 · 2018-05-02 03:15:06

1.4k

Views

Tangent lines to the curve parameterized by $x = a \cos(t)^4$, $y = a \sin(t)^4$

Published on 02 May 2018 - 3:15

score 66 · Answer 13 · 2018-05-02 10:04:20

If $\alpha=\beta+\omega$, then $1 + \cos\alpha+\cos\beta+\cos\omega = 4 \cos\frac{\alpha}{2}\cos\frac{\beta}{2}\cos\frac{\omega}{2}$

score 91 · Answer 14 · 2018-05-02 11:17:24

91

Views

The number of integer triplets $(a,b,c)$ such that $a+b\cos(2x)+c\sin^2x=0$ for all $x$

Published on 02 May 2018 - 11:17

score 1k · Answer 15 · 2026-03-25 04:35:58

1k

Views

General equation/function to get angle from x and y coordinates?

Published on 25 Mar 2026 - 4:35

List Question

prove that $\tan2x=\frac{2\sin x\cos x}{1-2\sin^2x}$

Calculating length of AD

Certain types of tangent values

Find the $\theta$ of $\frac{a}{\cos\theta}+\frac{b}{\sin\theta}=c$

Max area: Quadrilateral with fixed perimeter and interior angle

How would I constantly position a point above a ray?

About the relation $\tan^{-1} x= 2\tan^{-1}\left(x+\sqrt{1+x^2}\right)-\frac\pi2$

Can the hyperbolic cotangent be defined in terms of the projection of an intersection?

Find the general value of $x$ satisfying $\sin x=\frac{1}{2}$ and $\cos x=-\frac{\sqrt {3}}{2}$

How can we calculate the sum of sines or cosines where the angles are in geometric progression?

Determine relative coordinates of a point inside a triangle with only distances known

Tangent lines to the curve parameterized by $x = a \cos(t)^4$, $y = a \sin(t)^4$

If $\alpha=\beta+\omega$, then $1 + \cos\alpha+\cos\beta+\cos\omega = 4 \cos\frac{\alpha}{2}\cos\frac{\beta}{2}\cos\frac{\omega}{2}$

The number of integer triplets $(a,b,c)$ such that $a+b\cos(2x)+c\sin^2x=0$ for all $x$

General equation/function to get angle from x and y coordinates?

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