試卷名稱:106年 - 106 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#125264
年份:106年
科目:中山◆電機◆工程數學甲
13. Let f(z) = cotz, and C be a closed path | z |= 4 in counterclockwise direction. The evaluation of
f(z)dz is c + jd. Then which of the following statements is correct?
(A) c < 0, d ≤ 0
(B) c > 0, d > 0
(C) c = 0, 15 < d < 20
(D) c = 0, 1 < d < 10
(E) None of the above statements are correct.