# Derive 6 or Ti89 Sum or Product terms

#### Gustavis

Hi People (Hi)

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

example :

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

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

what I must try ? Thanks. (Bow)

#### CaptainBlack

MHF Hall of Fame
Firing up the old T2110 which has Derive 5 on it, it seems you should just simplify the $$\displaystyle \sum_{i=1}^{10}i^2$$ expression rather than expand it which appears to be what you have done.

CB