List questions from trigonometry

Published on 17 Apr 2026 - 5:01

272

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A question about a fly and a spider

Published on 10 Apr 2026 - 17:47

52

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Number of solution for $\sin x = 0$ in $[0,2π]$ are 2 or 3

Published on 17 Apr 2026 - 7:35

11.9k

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Finding the angle between a line and a plane

Published on 12 Apr 2026 - 15:13

323

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Sum of finite cosine functions

Published on 12 Apr 2026 - 2:21

79

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Solving $2\tan(x-15) = 3.7.$

Published on 17 Apr 2026 - 11:12

126

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If $\frac{a}{\sin{A}}=\frac{b}{\cos{A}}$, show that $\sin{A}\cos{A}=\frac{ab}{a^2+b^2}$

Published on 14 Apr 2026 - 19:16

374

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Summation Formula for Tangent/Secant Numbers

Published on 11 Apr 2026 - 21:00

5.1k

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If $\tan 9\theta = 3/4$, then find the value of $3\csc 3\theta - 4\sec 3\theta$.

Published on 15 Apr 2026 - 14:52

3.1k

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Can one simplify $\arctan(a\tan(x))$?

Published on 10 Apr 2026 - 20:37

488

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Find the value of $\sum_{r=1}^4 \log_2 (\sin(\frac{r\pi}{5}))$

Published on 16 Apr 2026 - 3:42

86

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Exponential double angle formula

Published on 12 Apr 2026 - 8:44

82

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Prove $ \frac{\sin\theta}{1-\cos\theta} - \frac{\sin\theta}{1+\cos\theta} = 2\cot \theta$

Published on 16 Apr 2026 - 12:05

454

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Find the general value of $\theta$

Published on 15 Apr 2026 - 5:14

413

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How to find the location of a point in 3D space from projected 2D angle

Published on 12 Apr 2026 - 9:42

List Question

How to solve $2 = x \tan(x)$?

A question about a fly and a spider

Number of solution for $\sin x = 0$ in $[0,2π]$ are 2 or 3

Finding the angle between a line and a plane

Sum of finite cosine functions

Solving $2\tan(x-15) = 3.7.$

If $\frac{a}{\sin{A}}=\frac{b}{\cos{A}}$, show that $\sin{A}\cos{A}=\frac{ab}{a^2+b^2}$

Summation Formula for Tangent/Secant Numbers

If $\tan 9\theta = 3/4$, then find the value of $3\csc 3\theta - 4\sec 3\theta$.

Can one simplify $\arctan(a\tan(x))$?

Find the value of $\sum_{r=1}^4 \log_2 (\sin(\frac{r\pi}{5}))$

Exponential double angle formula

Prove $ \frac{\sin\theta}{1-\cos\theta} - \frac{\sin\theta}{1+\cos\theta} = 2\cot \theta$

Find the general value of $\theta$

How to find the location of a point in 3D space from projected 2D angle

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