Level:
Project ID:
9000063803
Accepted:
1
Clonable:
0
Easy:
1
We are given the sequence \(\left (\cos n \frac{\pi }{4}\right )_{n=1}^{\infty }\).
Find the sum of the first six terms of this sequence.
\(-\frac{2+\sqrt{2}}
{2} \)
\(-\frac{\sqrt{2}}
{2} \)
\(- 1\)
\(0\)