If `|x+1/x|>2,` then x is

If f(x) =|(1, x, x+1),(2x, x(x-1), x(x+1)), (3x(x-1), 2(x-1)(x-2), x(x+1)(x-1))| then what is f(-1) +f(0) +f(1) equal to ?

If y=(x^(2)+x+1)/(x^(2)-x+1)," then "(x^(2)-x+1)^(2)y_(1)=

If f(x)=|[1,2(x-1),3(x-1)(x-2)],[x-1,(x-1)(x-2),(x-1)(x-2)(x-3)],[x,x(x-1),x(x-1)(x-2)]| . Then, the value of f(2020) is

If x is a positive integer, then |[x!,(x+1)!,(x+2)!],[(x+1)!,(x+2)!,(x+3)!],[(x+2)!,(x+3)!,(x+4)!]|=

In the expansion of (1 + x) (1 + x+ x^(2)) …(1 + x + x^(2) +… +x^(2n)) , the sum of the coefficients is