Find the volumes of the solids generated by revolving the regions bounded by the lines and curves in Exercises 41-46 about the x-axis.
41. y = x, y = 1, x = 0
42. y = 2Vx, y = 2, x = 0
43. y = x² + 1, y=x+3
44. y 4x2, y = 2-x =
45. y = sec x, y = V2, -π/4 ≤ x ≤ π/4
46. y = sec x, y = tan x, x = 0, x = 1