(x2 - 1)-12
(x2 - 1)1
(x2 - 1)
(x2 - 1)-1
Correct answer is A
x2(x2 - 1)-12 - (x2 - 1)12 = x2(x2−1)12 - (x2−1)121
= x2−(x2−1)(x2−1)12
= x2−x2+1(x2−1)12
= (x2 - 1)-12
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