I found something very strange working with Riemann sums and expansion series.(adsbygoogle = window.adsbygoogle || []).push({});

Can anyone tell me why

[tex]\frac{x^n}{\sum_{i=1}^n x^{n-i}}=\frac{(x-1)x^n}{x^n-1}[/tex]

Excuse the profanity, but I thought in the beginning this was a disgusting joke! :rofl: :yuck:

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Another try at a difficult proof

**Physics Forums | Science Articles, Homework Help, Discussion**