Calculate and sketch output voltage diagram if input signal is Vin = 3sin(3140t). Capacitor has not acumulated energy at beginning.

If we assume that diode doesn't conduct, vout(t) is zero. If it conducts, we model it with 0.7V voltage drop:

It must be id(t) > 0, for our assumption to be correct.

I stuck there. We have one DC (0.7V voltage drop model) and one AC source so it is neccessary to apply superposition, right?