Question

GIÚP EM VS Ạ.CẢM ƠN MNG NHIỀU🥺🥺🥺❤️😘😘😘

 

Answer 1

Bài 2: 

f: \(x^2+1=\dfrac{\left(x^2+1\right)\left(x^2-1\right)}{x^2-1}=\dfrac{x^4-1}{x^2-1}\)

\(\dfrac{x^4}{x^2-1}=\dfrac{x^4}{x^2-1}\)