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Decompose 1/(x²-1); the numerator beside (x-1) turns out to be
A1/2
B1
C2
D-1/2
Answer & Solution
Correct answer: A. 1/2
Put x = 1 in 1 = A(x+1) + B(x-1) to get 1 = 2A, so A = 1/2.
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