Question

How can I solve the trigonometric equation $\sin 3x- 2\cos^2x =0$?

score 119 · Answer 1 · 2018-10-23 14:21:30

119

Views

How can I solve the trigonometric equation $\sin 3x- 2\cos^2x =0$?

Published on 23 Oct 2018 - 14:21

score 192 · Answer 2 · 2018-10-23 15:24:30

192

Views

Why is $\cos(-2\pi/3) =-1/2$?

Published on 23 Oct 2018 - 15:24

score 46 · Answer 3 · 2018-10-23 18:07:37

46

Views

Evaluating $\sec\big(\frac{\pi}{4}+x\big).\sec\big(\frac{\pi}{4}-x\big)$

Published on 23 Oct 2018 - 18:07

score 48 · Answer 4 · 2026-04-12 12:49:26

48

Views

Joining walls into a trianglular prism

Published on 12 Apr 2026 - 12:49

score 401 · Answer 5 · 2018-10-23 20:24:17

401

Views

Find $\sin81^\circ$ given $\sin18^\circ=\dfrac{\sqrt{5}-1}{4}$

Published on 23 Oct 2018 - 20:24

score 903 · Answer 6 · 2026-04-12 08:39:37

903

Views

Prove the derivative of $\arctan(x)$ using derivative definition

Published on 12 Apr 2026 - 8:39

score 35 · Answer 7 · 2026-04-10 00:21:26

35

Views

Solution Method for a Trig Equation

Published on 10 Apr 2026 - 0:21

score 1.3k · Answer 8 · 2026-03-25 19:09:57

1.3k

Views

The integer part of $\sum_{k=0}^{44}\frac{1}{\cos(k^\circ)\cos((k+1)^\circ)}$

Published on 25 Mar 2026 - 19:09

score 34 · Answer 9 · 2026-04-12 02:57:18

34

Views

Find the Frequency (I think?) of a Sinusoidal Equation

Published on 12 Apr 2026 - 2:57

score 1k · Answer 10 · 2026-03-25 18:49:47

1k

Views

Basic proof that $\frac{d}{dx}(\sin(nx))=n\cos(nx)$

Published on 25 Mar 2026 - 18:49

score 56 · Answer 11 · 2026-03-26 14:13:35

56

Views

Projection of points on the spherical triangle $[\text{sphericalTriangle}(x,y,z) \Longleftrightarrow \text{planarTriangle}(a, b)]$

Published on 26 Mar 2026 - 14:13

score 65 · Answer 12 · 2018-10-24 14:52:32

65

Views

Distance from a point to a line segment using a custom distance function

Published on 24 Oct 2018 - 14:52

score 75 · Answer 13 · 2026-04-10 22:21:30

75

Views

How do I verify this Trigonometric Identity?

Published on 10 Apr 2026 - 22:21

score 1.3k · Answer 14 · 2018-10-25 16:16:23

1.3k

Views

Integrate$ \int x \cos(x) \sin(x)\; dx$

Published on 25 Oct 2018 - 16:16

score 250 · Answer 15 · 2026-04-12 08:11:51

250

Views

Continuous Bijection From $S^1$ to $[0,2\pi)$

Published on 12 Apr 2026 - 8:11

List Question

How can I solve the trigonometric equation $\sin 3x- 2\cos^2x =0$?

Why is $\cos(-2\pi/3) =-1/2$?

Evaluating $\sec\big(\frac{\pi}{4}+x\big).\sec\big(\frac{\pi}{4}-x\big)$

Joining walls into a trianglular prism

Find $\sin81^\circ$ given $\sin18^\circ=\dfrac{\sqrt{5}-1}{4}$

Prove the derivative of $\arctan(x)$ using derivative definition

Solution Method for a Trig Equation

The integer part of $\sum_{k=0}^{44}\frac{1}{\cos(k^\circ)\cos((k+1)^\circ)}$

Find the Frequency (I think?) of a Sinusoidal Equation

Basic proof that $\frac{d}{dx}(\sin(nx))=n\cos(nx)$

Projection of points on the spherical triangle $[\text{sphericalTriangle}(x,y,z) \Longleftrightarrow \text{planarTriangle}(a, b)]$

Distance from a point to a line segment using a custom distance function

How do I verify this Trigonometric Identity?

Integrate$ \int x \cos(x) \sin(x)\; dx$

Continuous Bijection From $S^1$ to $[0,2\pi)$

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