List questions from trigonometry

Published on 13 Oct 2018 - 23:10

38

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Help with trigonometry equation

Published on 08 Apr 2026 - 14:53

44

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For $x\in(3\pi/2,5\pi/2)$ how can one find the values of $k$ such that $\arctan(\tan(x)) = x+k\pi$?

Published on 14 Oct 2018 - 8:24

190

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Simplifying $\frac{\cos(4a)-1}{\sin(a)-\sin(3a)}$

Published on 26 Mar 2026 - 17:30

62

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General term for the sum $\sum \sin(k)$

Published on 11 Apr 2026 - 3:17

51

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Find the product $\sec x\cdot \csc x$

Published on 14 Oct 2018 - 12:35

433

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Trigonometry problem $\sin100^\circ+\cos70^\circ\over\cos80^\circ-\cos20^\circ$

Published on 14 Oct 2018 - 18:58

90

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Prove the given identity: $\frac{{1-\cos x}}{1 + \cos x}=\tan^2\frac{{x}}{2}$

Published on 14 Oct 2018 - 19:19

458

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Abelian group operation on $(0, 1)$

Published on 11 Apr 2026 - 17:01

57

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Are there non-constant functions $a(z)$, $b(z)$, $c(z)$, $d(z)$ satisfying $a(z) \cos (z) + b(z) \sin (z)=c(z) \cos (z) + d(z) \sin (z)$?

Published on 12 Apr 2026 - 1:52

7.9k

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Integral of $\sin^5(x)\cos(x)$

Published on 26 Mar 2026 - 22:14

2.4k

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Project line onto a circle

Published on 12 Apr 2026 - 0:37

67

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The area of a triangle with sides $11$, $12$, and $x$ is $28.9$. Find $x$.

Published on 27 Mar 2026 - 18:27

240

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How to solve $\sin^2 (2x) = 2 \sin (2x)$

Published on 12 Apr 2026 - 4:28

371

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Span of sine and cosine equals span of positive and negative complex exponentials proof

Published on 08 Apr 2026 - 16:34

List Question

How can I know the values of: $\sin(i)$ and $\cos(i)$?

Help with trigonometry equation

For $x\in(3\pi/2,5\pi/2)$ how can one find the values of $k$ such that $\arctan(\tan(x)) = x+k\pi$?

Simplifying $\frac{\cos(4a)-1}{\sin(a)-\sin(3a)}$

General term for the sum $\sum \sin(k)$

Find the product $\sec x\cdot \csc x$

Trigonometry problem $\sin100^\circ+\cos70^\circ\over\cos80^\circ-\cos20^\circ$

Prove the given identity: $\frac{{1-\cos x}}{1 + \cos x}=\tan^2\frac{{x}}{2}$

Abelian group operation on $(0, 1)$

Are there non-constant functions $a(z)$, $b(z)$, $c(z)$, $d(z)$ satisfying $a(z) \cos (z) + b(z) \sin (z)=c(z) \cos (z) + d(z) \sin (z)$?

Integral of $\sin^5(x)\cos(x)$

Project line onto a circle

The area of a triangle with sides $11$, $12$, and $x$ is $28.9$. Find $x$.

How to solve $\sin^2 (2x) = 2 \sin (2x)$

Span of sine and cosine equals span of positive and negative complex exponentials proof

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