In Problem, find the volume of the solid generated when the region R bounded by the given curves is revolved about the indicated axis. Do this by performing the following steps
(a) Sketch the region R.
(b) Show a typical rectangular slice properly labeled.
(c) Write a formula for the approximate volume of the shell generated by this slice.
(d) Set up the corresponding integral
(e) Evaluate this integral
y = 1/x, x=1, x = 4, y = 0 about the y-axis