Question 984371
<font face="Times New Roman" size="+2">


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \sum_{i+1}^n\,\left(-1\right)^{i+1}\,i^2\ =\ \left(-1\right)^{n+1}\,\frac{1}{2}\left(n\left(n\ +\ 1\right)\right)]


If you would like a proof, let me know and we can negotiate a fee.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it

*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \