Dear Legendsn3verdie,
you've calculated well. It is behind the last step:
What are the coefficents a_i? You know it, I'm sure.
hm i m stuck on this problem.. i dont know if i did it correctly.
find the taylor series generated by f at x = a.
did i take the derivatives wrong?? i found the taylor series but dont i need the formula of that series? hm any help appreciated big time.