Trigonometry lesson 9 - Definition of sine and cosine using the unit circle
In this lesson, we talk about why it is that, for any point on the unit circle, x=cos(theta) and y=sin(theta).
Posted from my blog with SteemPress : http://magicmonktutorials.com/blog/2018/10/13/trigonometry-lesson-9-definition-of-sine-and-cosine-using-the-unit-circle/