- #1
twoski
- 181
- 2
Homework Statement
Using disks or washers, find the volume of the solid obtained by rotating the region bounded by the curves y = sec(x), y = 1, x = 1, x = -1 on the x-axis.
The Attempt at a Solution
This should be ridiculously easy but apparently my answer is wrong?!
To calculate the volume i use the equation [itex]V = \pi \int _{-1}^{1} (sec(x)^{2} - 1)dx[/itex]
From here it should be trivial since this evaluates to [itex]\pi [ tan^{2} x | _{-1}^{1} ] = 0[/itex]
But my answer is apparently wrong... Should i be doing something differently? I've followed the formula exactly how it should be followed to my knowledge.