$$\[ y=\operatorname{arsinh}\left(\sqrt{x^{2}-1}\right) \quad x> 1 \]$$ $$\[ \mathrm{f}(x)=\frac{1}{3} \operatorname{arsinh}\left(\sqrt{x^{2}-1}\right)-\arctan x \quad x> 1 \]$$ (b) Determine the exact values of $$\(x\)$$ for which $$\(\mathrm{f}^{\prime}(x)=0\)$$ (4)

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