(1) Find the area of the region bounded by the given curves.
y = cos(x) y = cos^3(x) x = 0 x = pi/2
(2) Find the area of the region bounded by the hyperbola 9x^2 - 4y^2 = 36 and the line x = 3.
(3) Find the volume obtained by rotating the region bounded by the given curves about x-axis.
y = cos(x) x = 0 x = (pi/2) y = 0