Could you please help me decide on these answers?
The question is " Are the following statements Sinusoidal? And are they Periodic?
I have produced the waveforms in MathCad
The limits are 0 - 4Pi
1.f(x)= sinx + 2sin(x-(Pi/6))
2.f(x)= sinx +sin2x
3.f(x)= sinx + 1/2(sin2x)
4.f(x)= sinx + 1/3(sin3x)+1/5(sin5x)
The Attempt at a Solution
I think they are all periodic as my understanding of periodic is that the waveform repeats itself after 2pi (360 degrees) Which they all seem to do.
I am unsure about the Sinusoidal part though. I know that number 1 is but not sure about the rest!! How do I tell?
I also have to work out the r.m.s value of a complex waveform, Am I right in saying that if its sinusoidal I can use Vmax/root2? If its not sinusoidal can I use this formula?