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]

$$\frac{x-1}{1+x} = \frac{x+1-2}{x+1} = ... ?$$

 

[annoymage]

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