Sin/Cos - "Where is this point on the circle?”

Imagine a circle centered at (0,0,0) with radius 1

Now pick a point on the circle and rotate it around the center.

cos tells you how far left/right. sin tells you how far up/down. And θ (theta) is simply the angle telling you where you are on the circle.

$$ \Large \cos(\theta) \rightarrow X\text{ coordinate} \rightarrow -1\text{ to }1 $$

$$ \Large \sin(\theta) \rightarrow Y\text{ coordinate} \rightarrow -1\text{ to }1 $$