ĐKXĐ:...
\(P=\left(\frac{\left(x-1\right)^2}{\left(x+1\right)\left(x-1\right)^2}-\frac{2x}{\left(x+1\right)\left(x-1\right)^2}\right):\left(\frac{x^2-2x+1}{x^2+1}\right)\)
\(=\frac{\left(x^2-4x+1\right)}{\left(x+1\right)\left(x-1\right)^2}.\frac{\left(x^2+1\right)}{\left(x-1\right)^2}\)
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