If f(x) = (4x + x^4)/(1 + 4x^3) and g(x) = ln((1 + x)/(1 - x)), then what is the value of f o g((e - 1)/(e + 1)) equal to? - NDA Mathematics 2017 (II)

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If f(x) = (4x + x^4)/(1 + 4x^3) and g(x) = ln((1 + x)/(1 – x)), then what is the value of f o g((e – 1)/(e + 1)) equal to?