How do you find the value of cos 2π?

1 Answer
Gió
Oct 2, 2015

You get #cos(2pi)=1#

Explanation:

The easiest way (at least for me) it is "to see" its value using the unit circle and the meaning of #cos# in terms of the "length"of it.
Consider a circle of radius #1# and on this circle a point #P#. The point produces a projection, depending upon the angle #alpha#, on the horizontal axis that is our #cos# (segment #OA#):
enter image source here

Related questions
See all questions in Trigonometric Functions of Any Angle
Impact of this question
79015 views around the world
You can reuse this answer
Creative Commons License