(1)/(x^(4)+x^(2)+1)

If x^(2)=k+1 , then (x^(4)-1)/(x^(2)+1) =

3cos^(-1)x=sin^(-1)(sqrt(1-x^(2))(4x^(2)-1))

Lt_(x to (1)/(2))((x)/(2x-1)-(2x)/(4x^(2)-1))=

The factor of x^8 + x^4 +1 are (A) (x^4 + 1 - x^2), (x^2 +1 +x), (x^2 + 1 - x ) (B) x^4 + 1 -x^2 , (x^2 - 1 + x), (x^2 +1 + x) (C ) (x^4 - 1 + x^2, (x^2 - 1 + x), (x^2 + 1 + x) (D) (x^4 -1 + x^2), (x^2 + 1 - x), (x^2 + 1 +x)

(2x + 1) / (x) + (4x) / (2x + 1) = 5

define and plot y=|x-1|+|x-4|-2|x+1|