**What is Trigonometry?**

A Quick Introduction

The following provides an outline of all the topics you would expect to see in a typical

**Trigonometry**class (i.e., Precalculus or even Algebra II with Trig).

All of the topics are covered in detail in our Online Trig Course.

The online course provides the following:

- Full Lectures –
*Designed to boost your test scores.* - 150+ HD Video Library –
*No more wasted hours searching youtube.* - Available 24/7 –
*Never worry about missing a class again.* - Practice Exams –
*Ensure you’re ready for your finals.*

## An Overview of Trig Topics

An Overview of Trig Topics

The following sections contain links to our full lessons on all Trigonometry topics.

Also, be sure to check out our FREE tutoring videos and read our reviews to see what we’re like.

## Trigonometric Functions

8 Videos 119 Examples

- Interval Notation
- Coterminal Angles
- Reference Triangles
- Reference Angles
- Cofunctions
- Degrees Minutes Seconds
- Angles of Elevation and Depression
- Applications of Right Triangles

## Graphing Trig Functions

4 Videos 21 Examples

- Graphing Sine and Cosine
- Graphing Sine and Cosine with Period Change
- Graphing Sine and Cosine with Phase Shift
- Graphing Reciprocal Trig Functions

## Radian Measure

4 Videos 66 Examples

- Degrees to Radians
- Arc Length Formula
- Unit Circle
- Angular and Linear Velocity

## Trig Identities

7 Videos 77 Examples

- Fundamental Trigonometric Identities
- Steps for Verifying Trig Identities
- Proving Trig Identities
- Sum and Difference Identities
- Double Angle Identities
- Half Angle Identities
- Product-Sum Identities

## Trig Equations

4 Videos 53 Examples

- Inverse Functions
- Inverse Trig Functions
- Solving Trigonometric Equations
- Solving Trig Equations Using Inverses

## Law of Sines and Cosines

4 Videos 16 Examples

- Law of Sines
- Law of Sines – Ambiguous Case
- Law of Cosines
- Heron’s Formula

## Vector Applications

4 Videos 27 Examples

- What is a Vector?
- Displacement Vector
- Force Vector
- Velocity Vector

## Polar Equations and Graphs

2 Videos 34 Examples

- Polar Coordinates
- Graphing Polar Equations

## Complex Numbers

3 Videos 29 Examples

- Complex Numbers in Standard Form
- Complex Numbers in Polar Form
- De Moivre’s Theorem – Powers and Roots of Complex Numbers

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