Question

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

Answer 1

$dfrac a{a^2-b^2}-dfrac a{a^2+ab}=dfrac a{(a-b)(a+b)}-dfrac a{a(a+b)}=dfrac a{(a-b)(a+b)}-\-dfrac 1{a+b}=dfrac{a-(a-b)}{(a-b)(a+b)}=dfrac b{a^2-b^2}$