Question: The circle x = a cos t, y = a sin t, 0 t 2, is revolved about the line x = b,

The circle x = a cos t, y = a sin t, 0 ≤ t ≤ 2π, is revolved about the line x = b, 0 < a < b, thus generating a torus (doughnut). Find its surface area.

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