Cameroon Baccalauréat Série C Practice Questions - Cameroon Baccalauréat Série C (Mathématiques Et Sciences Physiques) Exam

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Let $f$ be the real function defined on $\mathbb{R}$ by $f(x) = \ln\left(x + \sqrt{x^2 + 1}\right)$. What is the first derivative $f'(x)$?

\frac{1}{x + \sqrt{x^2+1}} \frac{1}{\sqrt{x^2+1}} \frac{x}{\sqrt{x^2+1}} \frac{2x}{\sqrt{x^2+1}}

Correct Answer:

\frac{1}{\sqrt{x^2+1}}

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