volume of revolving solid

[alex83]

let R be the region in the plane bounded by the x-axis and the line x=1 and the curve y= arc tan x
determine the volume of the solid obvtained by revolving R
about the y-axis

any help pls

 

[galactus]

See here:

http://www.mymathforum.com/viewtopic.php?f=15&t=6828