Simplify a+ba−b+a−ba+b\frac{\sqrt{a} + \sqrt{b}}{\sqrt{a} - \sqrt{b}} + \frac{\sqrt{a} - \sqrt{b}}{\sqrt{a} + \sqrt{b}}a−ba+b+a+ba−b.
2(a+b)a−b\frac{2(a+b)}{a-b}a−b2(a+b)
a+ba−b\frac{a+b}{a-b}a−ba+b
2(a−b)a+b\frac{2(a-b)}{a+b}a+b2(a−b)
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