Question

What is the
value of 2npie

Answer 1

The answer to this problem is 6.28.

Answer 2

The Correct Answer to your problem is 6.28

Depends on the value of n. If n is even, cos(n*pi) = cos(0) = 1 If n is odd, cos(n*pi) = cos(pi) = -1

cos(0) = 1 When you make 1 full 2pi rotation, you end up at the same place. So cos(2*n*pi) = cos(0) = 1.