Simplify (frac{x^2 – 1}{x^3 + 2x^2 – x – 2})

A.
(frac{1}{x + 2}) 
B.
(frac{x – 1}{x + 1}) 
C.
(frac{x – 1}{x + 2}) 
D.
(frac{1}{x – 2})
Correct Answer: Option A
Explanation
(frac{x^2 – 1}{(x – 1)(x + 2)(x + 1)}) = (frac{(x –
1)(x + 1)}{(x – 1)(x + 2)(x + 1)})
= (frac{1}{x + 2})