有關最小取樣頻率的問題

Question

我想問一題取樣頻率的答案,能有計算過程會更好
What's the minimal frequency for sampling: y=3sin(x/4)+2cos^2(x/3)

Answer 1

frequency of sin(x/4) = 2π/(8π)= 1/4
frequency of cos^2(x/3) = 2π/(3π)= 2/3
so, fmax= 2/3
(Nyquist)minimal frequency= 2*2/3= 4/3