Question

How do you find the value of `cos 8(pi)` using the graph?

Answer 1

`color(blue)(1)`

Explanation:

`8pi` is 4 complete revolutions around the unit circle. If we start at `0` and cycle 4 times around the unit circle, we are back to where we started. i.e. `0`.

`cos(8pi)=cos(0)=color(blue)(1)`