Homework SourseUsing known series and algabraic operations obtain the first
Using known series and algabraic operations, obtain the first four non zero terms in the power series (in powers of x), for the function (e^-x)cosx.
Solution
exoand both series :
e-x = 1 - x + x*x/2! - x*x*x/3! ....
cosx = 1 - x*x/2! + x*x*x*x/4! ...
e-x cosx = 1 -x + 2x*x*x/3! + 2x*x*x*x/4! ..... first four terms !!!
