Calculus integrate | Calculus homework help

Using a graph calculator find the limit of the region:

1. Find the area fo the region y= e^-x sin (pi X), y=0, x=0 and x=1

2. Find the volume of the solid per revolution generate around the area 

y= sin , y=0   pi/2 <_ x <_ pi 

Need a detail explanation of the Integrate