Figure 1 shows the curve with equation $$\[ y=\ln \left(\tanh \frac{x}{2}\right) \quad 1 \leqslant x \leqslant 2 \]$$ Hence show that $$\[ s=\ln \left(\mathrm{e}+\frac{1}{\mathrm{e}}\right) \]$$ (4)

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