Trigonometry Series (Part 1)

Welcome to the first part of my trigonometric series. I will discuss all the basic knowledge you need to have concerning trigonometric functions and end the series with some examples and problems.

Consider a right-angled triangle

(Right-angled means that there is an angle which is 90 degrees, or π/2.)

We define the trigonometric functions as follow




together with



We will almost always make use of right-angled triangles when working with trigonometric functions because of the way that they are defined.

Graphs:

(Graphs from: http://www.algebra-help.org)

Next time I will discuss some important angles.