간소화(x+1)^2*(x-1)^2*(x^+1)^2

간소화(x+1)^2*(x-1)^2*(x^+1)^2

(x+1)^2*(x-1)^2*(x^2+1)^2
=(x^2-1)^2 *(x^2+1)^2
=(x^4-1)^2