試卷名稱:107年 - 107 國立中山大學_碩士班招生考試_電機系(甲、己組)、電波領域:工程數學甲#110523
年份:107年
科目:中山◆電機◆工程數學甲
2.Consider a discrete signal x(n) = cos(2nr / N), where integer N is the fundamental period. Let a be the coefficients of the discrete-time Fourier series of x(n). Then which of the following statements is correct?
(A) a1=-1/2,a2=1/2.
(B) a1=a2=j/2
(C)
(D) 
(E) None of the above statements are correct.