Sum the series by observing that and using the identity .
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Originally Posted by tarheelborn Sum the series by observing that and using the identity . lets see what you've tried.
I am really not sure where to start with this. I did verify that . So , and .
Originally Posted by tarheelborn I am really not sure where to start with this. I did verify that . So , and . you're simplifying prematurely. slow down. just plug in the expressions first: Now what? (you can write out the expression for a few more terms if you don't see a pattern or what to do)
I really just don't see it. It looks like it would be but that doesn't make sense.
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