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Homework Statement:
 Sketch f(x) in the range 2l<x<2l
Relevant Equations:
 The equation is in the picture attached
I have no idea why my sketch is wrong.
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I have attached the full question as stated in the problem sheet. I am just stuck in the sketching part.But your function looks to be only defined over l to +l  why are you asked to extend it outside of that definition? Is there more to the question? Is that really how the problem is stated in the book?
Ah, yes. You left out the "and" part...I have attached the full question as stated in the problem sheet.
According to the belated problem statement, f(x) = f(x + 2l).So f(x) should equal f(2l), not f(3l/2)...
Yeah, thanks Mark. I meant f(x) = f(x + 2l), not = f(x + 3l/2). Trying to type too fast I guess...According to the belated problem statement, f(x) = f(x + 2l).