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Originally Posted by yeloc Now apply your known formulas
Can you explain how you went from the first step to the second step?
Originally Posted by Mathstud28 Now apply your known formulas Originally Posted by yeloc Can you explain how you went from the first step to the second step? I can see why you'd be a bit puzzled ..... here's the trick: Substitute into . Then you get: . Note the corrections (in red) to some typos.
Please forgive me, but I am still not understanding why you substitute
Originally Posted by yeloc Please forgive me, but I am still not understanding why you substitute Because that's what Mathstud28 did to get the result that you asked about. If you don't like that, just expand the original summand: . Now use the usual formulae on each term.
Ohh ok...thanks!
Originally Posted by mr fantastic I can see why you'd be a bit puzzled ..... here's the trick: Substitute into . Then you get: . Note the corrections (in red) to some typos. Thank you for catching that typo...after doing so many infinite sreies you just forget to lower the upper index.
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