List questions from trigonometry

Published on 24 Jan 2018 - 20:22

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Confirmation of Proof: $\cos^2(x) = \frac 12\big(1+\cos(2x)\big)$ using Euler's identity?

Published on 25 Jan 2018 - 3:33

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precalculus - length of the sides of a triangle

Published on 25 Jan 2018 - 5:29

575

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$\tan{A} \cdot \tan{B} \cdot \tan{C}=9$, find $\tan^2{A}+\tan^2{B}+ \tan^2{C}$

Published on 25 Jan 2018 - 11:24

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Derivative of $\tan x$ without using derivative of $\sin x$ and $\cos x$

Published on 25 Jan 2018 - 13:51

88

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tangents/cotangents on unit circles

Published on 29 Mar 2026 - 18:20

79

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Limit of $x^2(1 - x \sin \frac{1}{x})$ as $x \to \infty$

Published on 26 Mar 2026 - 10:48

507

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Given the elevation, find height using trigonometry

Published on 25 Jan 2018 - 17:33

61

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Cosine Summation Lemma

Published on 25 Jan 2018 - 19:48

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Proving an inequality of functions over $\mathbb{C}$

Published on 20 Mar 2026 - 7:32

217

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Find Radius of a Circle a Point Lies on Given Its Latitude

Published on 26 Jan 2018 - 2:02

326

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Simplify Trig Expression

Published on 26 Jan 2018 - 3:16

89

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Determining angle given y of an oscillating function with constants c and r over a bounded range.

Published on 25 Mar 2026 - 1:26

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Prove that $|\Phi(p)|^2 \propto\sin^2\left( \frac{p L}{\hbar}\right) $

Published on 29 Mar 2026 - 11:10

663

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Parallelogram and similar triangles question

Published on 24 Mar 2026 - 23:54

List Question

Finding $\dfrac{1}{1+\tan 70^{\circ}}+\dfrac{1}{1+\tan 20^{\circ}}$

Confirmation of Proof: $\cos^2(x) = \frac 12\big(1+\cos(2x)\big)$ using Euler's identity?

precalculus - length of the sides of a triangle

$\tan{A} \cdot \tan{B} \cdot \tan{C}=9$, find $\tan^2{A}+\tan^2{B}+ \tan^2{C}$

Derivative of $\tan x$ without using derivative of $\sin x$ and $\cos x$

tangents/cotangents on unit circles

Limit of $x^2(1 - x \sin \frac{1}{x})$ as $x \to \infty$

Given the elevation, find height using trigonometry

Cosine Summation Lemma

Proving an inequality of functions over $\mathbb{C}$

Find Radius of a Circle a Point Lies on Given Its Latitude

Simplify Trig Expression

Determining angle given y of an oscillating function with constants c and r over a bounded range.

Prove that $|\Phi(p)|^2 \propto\sin^2\left( \frac{p L}{\hbar}\right) $

Parallelogram and similar triangles question

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