Hello, I am having difficulty with this Fourier Series:

6218_123.bmp
The 1st problem is stated as such; What is the amplitude of the second harmonic of V (Voltage).

The 2nd problem is stated as such; What is the DC component of V (Voltage).

The 3rd problem is stated as such; What is the Fundamental frequency of (Voltage).

It would be great if someone out there could help with all of part of this...

Best Regards
Ward (Clawman)

The 2nd harmonic of a Fourier series $\displaystyle \sum a_n$ is defined as the component $\displaystyle a_n$ where $\displaystyle n = 2$. To find the amplitude of that component you take the derivative of $\displaystyle a_n$ for that fixed n and look at the extrema.
The DC component is found by evaluating at $\displaystyle n = 0$. Since the series begins at $\displaystyle n = 1$ it would appear that the DC component is zero.