Multiply: a2−b2a2+2ab+b2⋅a+ba−b\frac{a^2 - b^2}{a^2 + 2ab + b^2} \cdot \frac{a + b}{a - b}a2+2ab+b2a2−b2⋅a−ba+b
111
a2−b2a+b\frac{a^2-b^2}{a+b}a+ba2−b2
(a−b)(a+b)(a+b)2\frac{(a-b)(a+b)}{(a+b)^2}(a+b)2(a−b)(a+b)
a−ba+b\frac{a-b}{a+b}a+ba−b