9. Let x: RΣ be the 2-segment in the sphere Σ obtained by restricting the geographical patch x(u, v) = (r cos v cos u, r cos v sin u, r sin v) to the rectangle R: 0 ≤u, v ≤ T/2. Find explicit formulas for the edge curves a, 6, 7, 8 of x, and show these curves and the image x (R) on a sketch of Σ.

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