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(x^2 -2x -99)/(x^2 -10x -11)
(x-11)(x+9)/(x-11)(x+1)
x+9/x+1
R/ (a^2b^2 +9)/(a^2b^2 +1)
b) x=a^2
(x^2 -x -12)/(x+3)(a-2)
(x-4)(x+3)/(x+3)(a-2)
x-4/a-2
(a^2 -4)/(a-2)
(a+2)(a-2)/(a-2)
R/ a+2