I'm needing a direction for this problem:

show terms correct to O$\displaystyle (\epsilon^2)$ for $\displaystyle \frac{1+\epsilon}{1-\epsilon}$ , $\displaystyle (1+\epsilon+\epsilon^2)^{1/2}$ , and $\displaystyle sin(1+\epsilon)$.

I'm thinking a series expansion for each expression. But I'm just a little confused. Any help or suggestions would be greatly appreciated.

Thanks!