Solve this following
Question:

If $y=\log \left(x+\sqrt{1+x^{2}}\right)$, prove that $\frac{d y}{d x}=\frac{1}{\log \left(x+\sqrt{1+x^{2}}\right)} \cdot \frac{1}{\sqrt{1+x^{2}}}$

Solution:

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