1. The problem statement, all variables and given/known data A continuous signal $$x(t)=15\sin (10t)+5\sin(30t)+3\sin(50t)$$ is sampled with frequency $\Omega =4.0$ Hz. Which frequencies are present in the sampled signal? 2. Relevant equations 3. The attempt at a solution No idea really. I seriously doubt it is that easy: Frequencies 10,30,50 are all greater than 4 Hz, meaning all three frequencies and probably even more? th question is how to find the others?