Question

if x÷y=a+2÷a-2 then x^2-y^2÷x^2+y^2=?​

Answer 1

(a+2)^2-(a-2)^2/(a+2)^2+(a-2)^2

=a^2+4a+4-(a^2-4a+4)/a^2+4a+4+a^2-4a+4

=a^2+4a+4-a^2+4a-4/a^2+4a+4+a^2-4a+4

=a^2+4a+4/a^2+4a+4

=1