let r be a positive real number. consider the solid is bounded by cylinders x² + y² = r² and x² + z² = r² ,
(a) Set up a triple integral to calculate the volume of E with order of integration dzdydx
(b) Set up a triple integral to calculate the volume of E with order of integration dzdxdy
(c) Find the volume of E using either part (a) or part (b).