-
The determine-time Fourier-coefficients X[k] for
will be
-
-
1 (δ[k - 6] + δ[k - 4] + δ[k + 6] + δ[k + 4]) 3 -
1 (δ[k - 6] + δ[k - 4] - δ[k + 6] - δ[k + 4]) 3 -
1 
cos 2πk 
- cos πk - cos πk + 1 6 3 2 3 -
1 sin 2πk - sin πk - sin πk + 1 6 3 2 3
-
Correct Option: C
The graph for x[n] is shown in the figure. 
| = | cos | | | - | cos | | | + | cos | | | + | |||||||
| 6 | 3 | 6 | 2 | 6 | 3 | 6 |
