Hey, I'm stuck on the radius of convergence for this problem too, can someone help? I followed the first part, the expansion fine but I'm a bit lost at the end.
Many thanks...
Nevermind, I think I've got the answer (modulus of x<10?)
I have a different question now though: Expand f(x)=e^(sinx) as far as the term in x^4, and state the radius of convergence
Can I simply use the expansion of e^x and sub in sinx for each x? And do the same for the radius of convergence?
Any help much appreciated.
Expand f(x)=e^(sinx) as far as the term in x^4, and state the radius of convergence.
Can I simply use the expansion of e^x and sub in sinx for each x?
This has given me:
1 + sinx + ((sinx)^2)/2 + ((sinx)^3)/6 + ((sinx)^4)/24
This does not strike me as being correct as I do not have an x^4 term, only a (sinx)^4
And do the same for the radius of convergence?
These functions lack radii of convergence, which is also causing me to doubt my method.
Apologies for only editing, my knowledge of internet forum etiquette is limited.
If you meant that I should start a new thread as it is a new question, I will and sorry for the inconvenience.
May I also get conformation on the radius of convergence for the question posed by the opening poster?