How do you prove that one is equals to two?

Answer 1

let a=b

=>

a^2=a*b

subtract by b^2 on both sides

=>

(a^2)-(b^2)=(a*b)-(b^2)

(a+b)(a-b)=b(a-b)

=>

a+b=b

since a=b

2a=a

=>

2=1......