x2 - 1
x2 + 1
x2 + 4
x2 - 4
1
Correct answer is D
a{x+1x−2−x−1x+2} = a{(x+1)(x+2)−(x−1)(x−2)(x−2)(x+2)}
= 6
6xx2−4 = 6x
a = x2 - 4
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