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

NDA 2017 Mathematics question

If and , then what is the value of equal to?

Answer: (B)

With : and ,

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Question ID VK-028786