List questions from trigonometry

Published on 25 Mar 2026 - 20:40

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Find $\sin x$ and $\cos x$ knowing $\tan x$

Published on 03 Dec 2018 - 9:14

251

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Solve $\sqrt{2}\sec x+\tan x=1$

Published on 03 Dec 2018 - 10:01

84

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Finding an exact solution for $u(x)+\int_0^{2π}\cos(x+t)u(t)\,\mathrm dt=(π+1)\cos x$

Published on 03 Dec 2018 - 12:09

176

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Solving $\sec^2(x)-2\sqrt{2} \sec(x)+2=0$

Published on 03 Dec 2018 - 13:25

392

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Inequality for $\sin(20°)$

Published on 01 Apr 2026 - 5:29

104

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Is it possible to find a closed form for $x$?

Published on 10 Apr 2026 - 12:20

292

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Solving the system $2{\sqrt 2}\sin(x) +3\cos(y) =3.5$ and $2\sin(2x)+5\cos(2y)=-0.5$

Published on 02 Apr 2026 - 19:53

647

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Find a new point on a rectangle given an angle from the center

Published on 12 Apr 2026 - 22:27

311

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A triangle has sides $3x+1$, $x+2$, $x+3$ and an angle with a known cosine; find $x$ and area

Published on 03 Dec 2018 - 23:26

70

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What is the meaning of the curvy line in $\widetilde{\sin}\theta$ and $\widetilde{\cos}\theta$?

Published on 13 Apr 2026 - 21:47

102

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What is the length of the hypotenuse?

Published on 13 Apr 2026 - 7:20

340

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Proof of range of tan $\theta$

Published on 13 Apr 2026 - 0:25

41.7k

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Difference between arcsin and inverse sine.

Published on 12 Apr 2026 - 6:35

1.4k

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Number of solutions of the equation $\cos(\pi\sqrt{x-4})\cos(\pi\sqrt{x})=1$

Published on 04 Dec 2018 - 18:07

List Question

Computing approximation of cos function

Find $\sin x$ and $\cos x$ knowing $\tan x$

Solve $\sqrt{2}\sec x+\tan x=1$

Finding an exact solution for $u(x)+\int_0^{2π}\cos(x+t)u(t)\,\mathrm dt=(π+1)\cos x$

Solving $\sec^2(x)-2\sqrt{2} \sec(x)+2=0$

Inequality for $\sin(20°)$

Is it possible to find a closed form for $x$?

Solving the system $2{\sqrt 2}\sin(x) +3\cos(y) =3.5$ and $2\sin(2x)+5\cos(2y)=-0.5$

Find a new point on a rectangle given an angle from the center

A triangle has sides $3x+1$, $x+2$, $x+3$ and an angle with a known cosine; find $x$ and area

What is the meaning of the curvy line in $\widetilde{\sin}\theta$ and $\widetilde{\cos}\theta$?

What is the length of the hypotenuse?

Proof of range of tan $\theta$

Difference between arcsin and inverse sine.

Number of solutions of the equation $\cos(\pi\sqrt{x-4})\cos(\pi\sqrt{x})=1$

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