Yes you can approximate by as n tends to infinity.There is nothing wrong in that.
As an example to enlighten you,even can be approximated by as n tends to infinity.
Last edited by ignite; April 29th 2012 at 05:01 AM.
We haven't learned Taylor series yet so I'm not supposed to use it, there must be another solution that they had in mind. Anyway, I'll ask the teaching assistant tomorrow for guidance and see what happens..