# Practice: Differentiation Of Logarithmic Equations

Calculus Level 2

$f(x)=\ln \left( \sqrt{x^{2}-2} \right)$

If $$f'(7)$$ can be expressed in the form $$\dfrac{a}{b}$$ where $$a$$ and $$b$$ are coprime positive integers, find $$a+b$$.

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