1
---------
2x^2-2
---------------
2 + x
---- -------
x+11 x^2-2x-3
work the denominator first.
2/(x+11) * x/(x^2-2x-3)
2/(x+11) * x/(x-3)(x-1)
get the common denominator..
add the fractions. Then invert,
1/(2(x^2-1) * inverted fraction