The Radian
If you've had any sort of education, you probably know that angles are measured in degrees. If you don't, then i highly suggest you re-consider your life choices.
To use these trigonometric functions in an actually good way that won't make mathematicians and engineers cope, seethe and mald, we'll convert these degrees into this other unit, called The Radian.
The radian is denoted by
You may convert from n degrees to r radians:
Let's get into deeper concepts now.