Question

a^2+b^2/a^2-b^2 x 4(a-b)/8a^2(a^2+b^2)

Answer 1

a^2+b^2/a^2-b^2 x 4(a-b)/8a^2(a^2+b^2) = (a^2+b^2)(a-b)(a+b) * 4(a-b)8a^2(a^2+b^2) = a-b2a^2(a+b)

Answer 2

 

a^2+b^2/a^2-b^2 x 4(a-b)/8a^2(a^2+b^2) =

= 4 / 8a^2 (a+b) = 

= 1 / 2a^2 (a+b).