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If the two roots of the equation (c-1)(x...

If the two roots of the equation `(c-1)(x^2+x+1)^2-(c+1)(x^4+x^2+1)=0` and real and distinct and `f(x)=(1-x)/(1+x)` then `f(f(x))+f(f(1/x))=` (A) `-c` (B) `c` (C) `2c` (D) none of these

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