The Taylor series centred about for the function is
Moderator edit: Sorry, Prove It. The formula is deleted. If the OP is working on a question like this, then surely s/he has studied it at some stage ...... s/he can refer to the formula in class notes or textbook, or can use Google.
What value do you think is in this case?
Once you have found the Taylor series, then you need to find its interval of convergence.