List of practice Questions

A continuous-time periodic signal \( x(t) = 1 + 2 \cos(4\pi t) + 2 \cos(6\pi t) \). If \( T \) is the time period of \( x(t) \), then \[ \frac{1}{T} \int_0^T |x(t)|^2 \, dt = \ \_\_\_\_\_? \]