Let s be the disk enclosed by curve c.r(t) = cos(φ) cos(t), sin(t), sin(φ) cos(t), for 0 ≤ t ≤ 2π, where 0 ≤ φ ≤ π 2 is a fixed angle.

Let s be the disk enclosed by curve

c.r(t) = cos(φ) cos(t), sin(t), sin(φ) cos(t), for 0 ≤ t ≤ 2π, where 0 ≤ φ ≤ π 2 is a fixed angle.

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