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試卷名稱：106年 - 106 國立中山大學_碩士班招生考試_電機系(乙組)：工程數學乙#125249
年份：106年
科目：中山◆電機◆工程數學乙
4. Consider the differential equation 
+ x = cos(ωa t). Which of the following is true?
(A) the general solution is sin(ω t) + C, C is a constant.
(B) the particular (forced) solution is periodic with period ω
(C) the solution is NOT bounded when t grows to infinity
(D) If x( π/ ω) = 1, then the solution is (sin(ω t) +π) / (ω t)
(E) none of the above
