Minimum value of ` x^2+1/(x^2+1)-3` is

The minimum value of x^(2)+(1)/(1+x^(2)) is at

For all real values of x, the minimum value of (1-x+x^2)/(1+x+x^2) is(A) 0 (B) 1 (C) 3 (D) 1/3

Choose the correct answer. For all real values of x , the minimum value of (1-x+x^2)/(1+x+x^2) is a)0 b)1 c)3 d)1/3

The minimum value of 2 x^(2)+x-1 is