Science

Math

Humanities

... and beyond

Socratic Meta
Featured Answers

Topics

How do you evaluate $cos 8 (π)$ $cos 8(pi)$ ?

1 Answer

Mar 30, 2018

$1$ $1$

Explanation:

Notice that one complete rotation is $2 π$ $2pi$ :

So $8 π$ $8pi$ is just 4 complete rotations. We therefore only need to find:

$cos (0)$ $cos(0)$

$cos (0) = 1$ $cos(0)=1$

Related questions

See all questions in Trigonometric Functions of Any Angle

Impact of this question

4987 views around the world

You can reuse this answer
Creative Commons License