In the end means "finally, eventually" while at the end is often used with the prepostion of. Of isn't required, though. He became happy in the end.
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imantaghaviYes. I got it.In the end means finally while we use at the end for physical addresses, right?Not just for addresses. "at the end" refers to position at the end of something.
imantaghaviSo you mean both are the same, right?No, I mean what I said. You cannot say: He became happy at the end.