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November 13th, 2018, 09:00 AM   #11
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Originally Posted by shadow dancer View Post
thanks for summery it's my last year , I've to wait literally till the end of the

year anddd please help my book has solved it in the most ridiculous way

I see that another way to go at this is to use the fact that the period is 4, if that's what the pic is showing. I didn't work the problem out all the way through so I would be interested in knowing what the book solution is.
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