• # question_answer If $f(x)=\left( \frac{1+x}{1+x} \right)$ and $g(x)=\frac{3x+{{x}^{3}}}{1+3{{x}^{2}}},$ then $f\,\,\left( g\left( x \right) \right)$ is equal to ________. A)  $3f\,\left( x \right)$ B)  ${{[f(x)]}^{2}}$ C)  $f\left( 3x \right)$                      D)  $-\,f\left( x \right)$ E)  None of these

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