1/(x-2) - 1/(x+2) = [x+2-(x-2)] / (x²-4) =(x+2-x+2)/(x²-4) = 4/(x²-4)
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1/(x-2) - 1/(x+2) = [x+2-(x-2)] / (x²-4) =(x+2-x+2)/(x²-4) = 4/(x²-4)