How do you find the value of cos 2π?

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How do you find the value of cos 2π?

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Answer 1 · 2015-10-02T16:30:42

You get $cos (2 π) = 1$ $cos(2pi)=1$

Explanation:

The easiest way (at least for me) it is "to see" its value using the unit circle and the meaning of $cos$ $cos$ in terms of the "length"of it.
Consider a circle of radius $1$ $1$ and on this circle a point $P$ $P$ . The point produces a projection, depending upon the angle $α$ $alpha$ , on the horizontal axis that is our $cos$ $cos$ (segment $O A$ $OA$ ):
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How do you find the value of cos 2π?

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