/sci/ - Science & Math

When they ask me to find the energy of this, am I supposed to actually find the power?
I thought that energy on signal was only meaningful if it approaches 0 as time goes to infinity.
In this case, it's a sinusoidal function so would I just integrate f(t)^2 between -T/2 and T/2? Also, what happens when you double the signal and multiply by a constant k? Doubling just increases the amplitude and multiplying by a constant increases the amplitude?