Find the volume of the solid formed by rotating the region bounded by the given curves about the indicated axis of revolution.

1. y = 1/x, y = 1, y = 5, x = 0; about the x-axis

2. y = e^x, y = x + 1, x = 0, x = 4; about the y-axis

3. x = 6y³ ? 2y⁴ in the first quadrant, x = 0; about the x-axis

4. y = x² + 3, x = 0, x = 2, y = 0; about x = 3

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