January 2019 1 56 Report
A) ( \frac{x+1}{1-x} - \frac{1-x}{x+1} - \frac{4 x^{2}}{ x^{2} -1}) : [ -2 ( \frac{1}{ x^{3} + x^{2} } - \frac{1-x}{ x^{2} } ) ]

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