Hi I'm not sure if it belongs in calculus but here it is anyway: Find the sum of for a constant Wolframalpha yielded but I would like to know how to derive it by hand.
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Originally Posted by oleholeh Hi I'm not sure if it belongs in calculus but here it is anyway: Find the sum of for a constant Wolframalpha yielded but I would like to know how to derive it by hand. The standard trick is to do it by differentiation, for consider this (assuming , of course) Now, apply this trick twice and you find that
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