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The final exact value obtained for the displayed arc-length integral is $\frac{208}{27}$. This is calculated by multiplying the outside constant $\frac{8}{27}$ by the evaluated bracket difference 26.

Conditions: The integral has been fully substituted and evaluated up to the step $\frac{8}{27}\cdot 26$.; The arithmetic simplification $8 \cdot 26 = 208$ is performed exactly.

The final exact value obtained for the displayed arc-length integral is $\frac{208}{27}$. This is calculated by multiplying the outside constant $\frac{8}{27}$ by the evaluated bracket difference 26.

Conditions: The integral has been fully substituted and evaluated up to the step $\frac{8}{27}\cdot 26$.; The arithmetic simplification $8 \cdot 26 = 208$ is performed exactly.