`(x+1/x)(x-1/x)(x^2+1/(x^2)-1)(x^2+1/(x^2)+1)` is equal to `x^6-1/(x^6)` (b) `x^8-1/(x^8)` (c) `x^6+1/(x^6)` (d) `x^8+1/(x^8)`

The product (x^(2)-1)(x^(4)+x^(2)+1) is equal to: x^(8)-1( b) x^(8)+1( c) x^(6)-1( d )x^(6)+1

The expression (1)/(x-1)-(1)/(x+1)-(2)/(x^(2)+1)-(4)/(x^(4)+1) is equal to (8)/(x^(8)+1)( b) (8)/(x^(8)-1)( c) (8)/(x^(7)-1) (d) (8)/(x^(7)+1)

x^(2)+(1)/(x^(2))-7(x-(1)/(x))+8

If x + (1)/(x) = 8 , then x^(2) + (1)/(x^(2)) is equal to :

((x-1)(x+1)(x+4)(x+6))/(7x^(2)+8x+4)>0