[" 9.If the two roots of the equation,"(a-1)(x^(4)+x^(2)+1)+(a+1)(x^(2)+x+1)^(2)=0" are real and distinct,then the set "],[" of all values of 'a' is "]

If the two roots (a-1)(x^(4)+x^(2)+1)+(a+1)(x^(2)+x+1)^(2)=0 are real and distinct,then the set of all values of 'a ' is.....

(B) (2,9/4 ) If two roots of the equation (a-1)(x^(2)+x+1)^(2)-(a+1)(x^(4)+x^(2)+1)=0 are real and distinct,then a lies in the interval

If all roots of the equation x^(3)+ax^(2)-ax-1=0 are real and distinct,then the set of values of a is

(B) (2, 9/4) If two roots of the equation (a-1) (x^2 + x + 1 )^2-(a + 1) (x^4 + x^2 + 1) = 0 are real and distinct, then a lies in the interval

(B) (2, 9/4) If two roots of the equation (a-1) (x^2 + x + 1 )^2-(a + 1) (x^4 + x^2 + 1) = 0 are real and distinct, then a lies in the interval

If the equation ((x)/(1+x^(2)))^(2)+a((x)/(1+x^(2)))+3=0 has exactly two real roots which are distinct, then the set of possible real values of a is ((-13)/(2),0) (b) (oo,-(13)/(2))((-13)/(2),(13)/(2))(d)((13)/(2),oo)

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

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