Here, I've mistaken a little bit, it actuall is:-

x= \frac{ \sqrt{a+2b}- \sqrt{a-2b} }{\sqrt{a+2b}- \sqrt{a-2b} }

x= \frac{ \sqrt{a+2b}+ \sqrt{a-2b} }{\sqrt{a+2b}- \sqrt{a-2b} } This is the real one

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