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

If two roots of the equation
`(p-1)(x^(2)+x+1)^(2)-(p+1)(x^(4)+x^(2)+1)=0` are real and distinct and `f(x)=(1-x)/(1+x)`, then `f(f(x))+f(f(1/x))` is equal to

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