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

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

=2(a-b)/(a+b) (reduced to this point)

=2(-5b-b)/(-5b+b)

=2(-6b)/(-4b)

=3

Condition: A is not equal to B; B is not equal to 0.