What is the finite expansion of a function means ?

[Za Kh]

i know the rules of finite expansion but i just want to know why do we need it and what does it mean ?

 

[Stephen Tashi]

The phrase "finite expansion" isn't specific. Can you give an example?

 

[SupernerdSven]

If you're referring to the Taylor expansion, this site provides several good reasons and examples. The reasons they list are approximations of all sorts, series solutions of differential equations, and limiting values.