Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified line. Sketch the region, the solid, and a typical disk or washer.
***Answer any 1 of the following.
a) y = e^x, y = 0, x = −1, x = 1; about the x-axis.
b) x = 2−y^2, x = y^4; about the y-axis.
c) y = sinx, y = cosx, 0 ≤ x ≤ π/4; about y = −1.