New posts in trigonometry

$\sin^2(x)+\cos^2(x) = 1$ using power series

calculus trigonometry power-series

Is the sum of two sine waves periodic? [closed]

trigonometry periodic-functions

Finding derivative of $\sqrt[3]{\sin(2x)}$ using only definition of derivative

real-analysis calculus derivatives trigonometry

Sum of angles under which a fixed line segment is seen from points situated on another line segment

calculus geometry algebra-precalculus trigonometry triangles

Simplifying $\cos(\arcsin x)$? [closed]

Show that $\tan 3x =\frac{ \sin x + \sin 3x+ \sin 5x }{\cos x + \cos 3x + \cos 5x}$

Trigonometry limit's proof: $\lim_{x\to0}\frac{\sin(x)+\sin(2x)+\cdots+\sin(kx)}{x}=\frac{k(k+1)}{2}$

limits trigonometry summation limits-without-lhopital

Why is my process of differentiation (trigonometric substitution) not working?

calculus derivatives trigonometry

What are some rigorous definitions for sine and cosine?

calculus real-analysis trigonometry

Prove that: $\sin(x) \cos(x) \geq x-x^3$

trigonometry inequality

A triangle has one vertex at a circle's center and two vertices on the circle. Can the three enclosed regions have rational areas?

real-analysis geometry number-theory trigonometry

Why and when can I just peacefully substitute into $\tan^{-1}x+\tan^{-1}y=\tan^{-1}\frac{x+y}{1-xy}$ without checking range conditions?

algebra-precalculus trigonometry

Solve $\sin^{3}x+\cos^{3}x=1$

Can't understand an ACT practice problem: Triangle appears to be isosceles, why isn't the answer $7.3\sim $ here?

geometry trigonometry fake-proofs

Compare $\arcsin (1)$ and $\tan (1)$

real-analysis trigonometry inequality inverse-function number-comparison

What is the significance of deciding the convention of $1 \text{ radian} = 180 \text{ degrees}$ over $\pi$?

trigonometry math-history convention

Find a mistake in the following bogus proof

trigonometry fake-proofs

Given $\tan\alpha=2$, evaluate $\frac{\sin^{3}\alpha - 2\cos^{3}\alpha + 3\cos\alpha}{3\sin\alpha +2\cos\alpha}$

algebra-precalculus trigonometry

How to “shrink” a triangle

geometry trigonometry

Is there a unit equal to 2pi radians?

trigonometry physics pi angle unit-of-measure