# Derive 6 or Ti89 Sum or Product terms

• June 19th 2010, 05:38 AM
Gustavis
Derive 6 or Ti89 Sum or Product terms
Hi People (Hi)

I search a method for expand all terms of Sum or Product in Derive 6

example :

$\sum_{i=1}^{10} i^2 = 385$ not this (Shake)

$\sum_{i=1}^{10} i^2 = 1+4+9+...$ <-- I need this ! (Nod)

what I must try ? Thanks. (Bow)
• June 19th 2010, 06:33 AM
CaptainBlack
Firing up the old T2110 which has Derive 5 on it, it seems you should just simplify the $\sum_{i=1}^{10}i^2$ expression rather than expand it which appears to be what you have done.

CB