HiI agree with Kermit.
PG, I also see your point about the average being zero over the span indicated by the author. This is misleading as you say. Normally average value means the average value of one half cycle, but it is the average of the positive half cycle, not the half cycle that has values both positive and negative.
I have another question related to this posting. Please help me with the Q2 in the attachment (ignore Q1). Thank you
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