Texts: question 6
3. Determine 2x^2 + 3x + 2dx.
4. Evaluate ∫(22sin^3x cosx)dx. Show your working.
5. Evaluate ∫(2e^5x cos2x)dx.
6. The area enclosed between the x-axis, the curve x^4 - x, and the ordinates x = 2 and x = 4 is rotated through 2π radians about the x-axis. Calculate:
1. The length of the arc from x = 2 and x = 4.
2. The rotating area and the coordinates of its centroid.
3. The volume of the solid of revolution formed and the coordinates of its center of gravity.