Compare resulting waveform to ideal half-rectified waveform

Question

Response to the following problem:

Plot a half-rectified waveform with a peak value of 20 V using Eq.

Use the dc term, the fundamental term, and four harmonics. Compare the resulting waveform to the ideal half-rectified waveform.

Eq.,   V₂ = 0.318V_m + 0.500V_m sin α - 0.212V_m cos 2α - 0.0424V_m cos 4α-..