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How do you (x-1)/(x^2+1) in partial fractions?

An expression to simplify:

The solution

You have entered [src]
x - 1 
------
 2    
x  + 1
$$\frac{x - 1}{x^{2} + 1}$$
(x - 1)/(x^2 + 1)
Fraction decomposition [src]
(-1 + x)/(1 + x^2)
$$\frac{x - 1}{x^{2} + 1}$$
-1 + x
------
     2
1 + x 
Numerical answer [src]
(-1.0 + x)/(1.0 + x^2)
(-1.0 + x)/(1.0 + x^2)