I have the following function:

f(x) =         1
         ----------------
         x^2 + 4*x + 13

I need to find its partial fraction expansion. As the factors are complex 
conjugates, I am not able to do using partial_fraction(). How can I find this?

Commands:
x = CC['x'].0
f = 1/(x^2 + 4*x+ 13)
f.partial_fraction()
this gives error:
Traceback (click to the left of this block for traceback)
...
AttributeError: 'FractionFieldElement_1poly_field' object has no
attribute 'partial_fraction'

System used: Ubuntu 12.04, 32 bit, Intel Core i5 procesor

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