6. Integrate f(x, y, z) =
6. Integrate f(x, y, z) =over the involute curve x = cos t + t sin t, y = sin t - t cos t, z = 0, 0 ≤ t ≤ . (15 points)
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over the involute curve x = cos t + t sin t, y = sin t - t cos t, z = 0, 0 ≤ t ≤ 
. (15 points)