Let a=b,[multiply both sides by b];ab=b^2(minus a^2 both sides);ab-a^2=b^2-a^2[factor ou the LHS using distributive law and use the difference in square for RHS];a(b-a)=(b-a)(b plus a),divide by (b-a) both sides;a=(b plus a),now remember a=b,then;a=(a plus a) au a=2a,divide by for both LHS and RHS;a/a=2a/a,then 1=2.Hence proven!