Question

Докажите тождество 
(1+8х³)/(1+2х)-2х=(1-2)²

Answer 1

(1+8x^3)/(1+2x)-2x=(1+2x)(1-2x+4x^2)/(1+2x)-2x=1-2x+4x^2-2x=1-4x+4x^2=(1-2x)^2