19 set up the intergal for the surface area generated by revolving yc sin ( x ) on the interval from oz XC IT about the X axis then use your calculator to find the value in square units Hlo use the disk method to find the volume of the circular cylinder obtained by revolving the region in the first quadrght bounded by * = 4 andy = 6 around the taxis then use the Formula V= Arch to confirm your resu