New posts in trigonometry

Simplifying $\frac{\omega\sin(\omega t)\tan(\omega{t})+\omega(\cos(\omega t)+1)\sec^2(\omega t)}{(\cos(\omega t) +1)^2}$

Is $\{\sin^n{(n)}:n\in\mathbb{N}\}$ dense in $[-1,1]$?

sequences-and-series limits trigonometry supremum-and-infimum

Is there always a positive $x$ that satisfies $\cos(n_1x)\leq0$, $\cos(n_2x)\leq0$, $\cos(n_3x)\leq0$ for given distinct positive integers $n_i$?

algebra-precalculus trigonometry inequality

In calculus, how should I interpret the -1 superscript in trigonometric functions?

calculus trigonometry notation inverse-function

Generalized sine integral $ \int_0^\infty \sin^m(x^n)/x^p\,\mathrm dx$

trigonometry definite-integrals improper-integrals

Inverse Cosine in Python

python math trigonometry

Could this conjecture be proved ? (sum of even powers of cotangents in arithmetic progression )

trigonometry polynomials summation closed-form

How to prove $\sum_{k=1}^n \cos(\frac{2 \pi k}{n}) = 0$ for any n>1? [duplicate]

sequences-and-series complex-analysis trigonometry complex-numbers trigonometric-series

Find the general value of $\theta$ for the inverse trigonometric function

algebra-precalculus trigonometry

Is the value of $\sin(\frac{\pi}{n})$ expressible by radicals?

trigonometry natural-numbers radicals

Infinite series for the arctangent from the tangent of half-angle formula

sequences-and-series trigonometry math-history

Parallelogram trigonometry

geometry trigonometry

A little more on $\sqrt[3]{\cos\bigl(\tfrac{2\pi}7\bigr)}+\sqrt[3]{\cos\bigl(\tfrac{4\pi}7\bigr)}+\sqrt[3]{\cos\bigl(\tfrac{8\pi}7\bigr)}$

trigonometry prime-numbers radicals roots-of-unity

What are the formal terms for the intersection points of the geometric representation of the extended trigonometric functions?

geometry trigonometry terminology

Prove inequality $\tan \left( \frac\pi2 \frac{(1+x)^2}{3+x^2}\right) \tan \left( \frac\pi2 \frac{(1-x)^2}{3+x^2}\right)\le\frac13 $

calculus trigonometry inequality

sum of series involving coth using complex analysis

sequences-and-series complex-analysis trigonometry

Is there a formula for the cosine of 1/5 of an angle?

Calculate the sum: $\sum_{x=2}^\infty (x^2 \operatorname{arcoth}(x) \operatorname{arccot} (x) -1)$

trigonometry summation hyperbolic-functions

Solving $\arcsin\left(2x\sqrt{1-x^2}\right) = 2 \arcsin x$

functions trigonometry inverse

$\arctan{x}+\arctan{y}$ from integration

integration trigonometry change-of-variable