CAT Quant Practice Problems

Question: The value of \(\frac{1}{{\left( {1 - x} \right)}} + \frac{1}{{\left( {1 + x} \right)}} + \frac{1}{{\left( {1 + {x^2}} \right)}} + \frac{4}{{\left( {1 + {x^4}} \right)}}\) is

\(\frac{8}{{\left( {1 - {x^8}} \right)}}\)
\(\frac{{4x}}{{\left( {1 + {x^2}} \right)}}\)
\(\frac{4}{{\left( {1 - {x^6}} \right)}}\)
\(\frac{4}{{\left( {1 + {x^4}} \right)}}\)
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