What is $ \lim_{x\rightarrow0} \frac{\sin x}{x}$ ? Recall the definition of a limit, repeated here for reference […]

# Category: Trigonometry

## The Radian

A radian is defined as follows. $360^{\circ} = 2 \pi$ radians. Dividing both sides by […]

## De Moivre’s Theorem

This is a proof of de Moivre’s Theorem. This was originally presented by reference [1]. […]

## Angle Addition Identities

This post includes proofs of two angle addition identities. $ \sin(x+y) = \sin x \cos […]