If , where , and , the least value of is given…

MATHEMATICS · Single correct · CBSE · Mathematics · Sequences and Series · Sequences and Series

Problem

f(x)=\frac{1-x}{1+x}

, where

x>0

, and

y=f(f(x))+f\left(f\left(\frac{1}{x}\right)\right)

, the least value of

y

is given by (a) 1 (b) 2 (c) 3 (d) 4