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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
3. Consider the differential equation 
+ kx = cos(ω t) and its sinusoidal solution 
. Which of the following is true?
(A) for a fixed b, the amplitude of 
is maximized when k = ω2
(B) for a fixed b, the maximal amplitude of 
is 1/b
(C) for fixed b and k, the amplitude of 
always grows as ω increases
(D) the period of 
is 2ω
(E) the period of 
depends on b and k.
