Finding Taylor Series for (x-1)/(1+x) at x=1

[annoymage]

Homework Statement

find taylor series for \frac{x-1}{1+x} at x=1

Homework Equations

The Attempt at a Solution

how to change this form

\frac{x-1}{1+x}

to something like this
\frac{1}{1+a} or \frac{1}{1-a}

help me please T_T

or should i do like this

\sum\frac{f^n(1)(x-1)^n}{n!}

and find fⁿ(x) form?

 

[justsof]

<br /> \frac{x-1}{1+x} = \frac{x+1-2}{x+1} = ... ?<br />

 

[annoymage]

owhhhhhh, I am soo stupid ngahahah, thank you thank you