List questions from trigonometry

Published on 31 Mar 2026 - 23:44

78

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Find $\cos2B+\cos2C$ in a triangle

Published on 25 Mar 2026 - 6:51

37

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Finding the bounding triangle of an incircle

Published on 23 Feb 2018 - 4:14

100

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Derivative of $\sin(x)$ issues

Published on 25 Mar 2026 - 23:08

122

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How to find the slope of a line that is kept at the same proportional distance to two others?

Published on 29 Mar 2026 - 17:45

141

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Minimise $\tan^2 A + \tan^2 B + \tan^2 C$ given a relation

Published on 25 Mar 2026 - 11:01

297

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Simplifying $\frac{6\tan x }{1-\tan^2 x}$ to $3 \tan 2x$

Published on 23 Feb 2018 - 11:16

512

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What is the value of $\sin^2 (\frac{\pi}{10}) \sin^2 (\frac{3\pi}{10})$?

Published on 25 Mar 2026 - 1:18

101

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Number of irrational roots in polynomial equation

Published on 24 Mar 2026 - 22:01

168

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What real $\lambda$ satisfy $\frac{\sin\lambda\alpha}{\sin\alpha}-\frac{\cos\lambda\alpha}{\cos\alpha}=\lambda-1$?

Published on 29 Mar 2026 - 20:55

571

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Finding the sin inverse

Published on 31 Mar 2026 - 15:55

112

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root of the equation $4\sin ^2x +10 x^2=\cos x$

Published on 29 Mar 2026 - 12:41

710

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How is a parabola related to a circle?

Published on 27 Mar 2026 - 15:23

214

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Closed form of the integral $\int_{0}^\infty \frac{\tan^{-1}{x} \tan^{-1}{\frac{x}{2}} \tan^{-1}{\frac{x}{3}}}{x^2+1} \, \text{d}x$

Published on 26 Mar 2026 - 2:57

54

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Let $x = \mathrm{asec}\,(\theta)$ in $\sqrt{x^2-a^2}$. Find $\sin(\theta)$ and $\cos(\theta)$

Published on 24 Feb 2018 - 0:46

List Question

Find angle of a rhombus

Find $\cos2B+\cos2C$ in a triangle

Finding the bounding triangle of an incircle

Derivative of $\sin(x)$ issues

How to find the slope of a line that is kept at the same proportional distance to two others?

Minimise $\tan^2 A + \tan^2 B + \tan^2 C$ given a relation

Simplifying $\frac{6\tan x }{1-\tan^2 x}$ to $3 \tan 2x$

What is the value of $\sin^2 (\frac{\pi}{10}) \sin^2 (\frac{3\pi}{10})$?

Number of irrational roots in polynomial equation

What real $\lambda$ satisfy $\frac{\sin\lambda\alpha}{\sin\alpha}-\frac{\cos\lambda\alpha}{\cos\alpha}=\lambda-1$?

Finding the sin inverse

root of the equation $4\sin ^2x +10 x^2=\cos x$

How is a parabola related to a circle?

Closed form of the integral $\int_{0}^\infty \frac{\tan^{-1}{x} \tan^{-1}{\frac{x}{2}} \tan^{-1}{\frac{x}{3}}}{x^2+1} \, \text{d}x$

Let $x = \mathrm{asec}\,(\theta)$ in $\sqrt{x^2-a^2}$. Find $\sin(\theta)$ and $\cos(\theta)$

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