c: \(\dfrac{2}{x-1}=\dfrac{2x+2}{\left(x-1\right)\left(x+1\right)}\)
\(\dfrac{2}{x+1}=\dfrac{2x-2}{\left(x+1\right)\left(x-1\right)}\)
\(\dfrac{1}{x^2-1}=\dfrac{1}{\left(x-1\right)\left(x+1\right)}\)
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