If we slice the object with planes at right angles to the x-axis, we find sections that are annuli between concentric circles of radius cos x and sin x. So the areas of these sections are Consequently, the required volume is
If we slice the object with planes at right angles to the x-axis, we find sections that are annuli between concentric circles of radius cos x and sin x. So the areas of these sections are
Consequently, the required volume is
