Shew that \[ \sqrt{a^{2}+b}=a+\frac{b}{2 a+2 a+} \frac{b}{2 a+} \ldots \]

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Shew that
\[
\sqrt{a^{2}+b}=a+\frac{b}{2 a+2 a+} \frac{b}{2 a+} \ldots
\]
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