Question
How do you prove algebraically whether the following is periodic?
f(x) = 3cos3x + 5sin4x
The sum of two periodic functions is always periodic. In your case, note than when x is a multiple of 2 pi, both functions repeat the values of x = 0.
f(x) = 3cos3x + 5sin4x
The sum of two periodic functions is always periodic. In your case, note than when x is a multiple of 2 pi, both functions repeat the values of x = 0.