# Chapter 5

# TRIGONOMETRY REFERENCE

## Right triangle trigonometry

A *right triangle* is defined as having one angle precisely equal to 90^{o} (a *right angle*).

### Trigonometric identities

H is the *Hypotenuse*, always being opposite the right angle. Relative to angle x, O is the *Opposite* and A is the *Adjacent*.

### The Pythagorean theorem

## Non-right triangle trigonometry

### The Law of Sines (for *any* triangle)

### The Law of Cosines (for *any* triangle)

## Trigonometric equivalencies

## Hyperbolic functions

Note: all angles (x) must be expressed in units of *radians* for these hyperbolic functions. There are 2π radians in a circle (360^{o}).