Consider the integral http://webwork.math.ucdavis.edu/webw...71da5a9931.png. If we change the order of integration we obtain the sum of two integrals: http://webwork.math.ucdavis.edu/webw...f1b85eb901.png
http://webwork.math.ucdavis.edu/webw...ea9131f391.png http://webwork.math.ucdavis.edu/webw...7973f0e8c1.png
http://webwork.math.ucdavis.edu/webw...c050b54e41.png http://webwork.math.ucdavis.edu/webw...449b8e37e1.png
http://webwork.math.ucdavis.edu/webw...61d577bdc1.png http://webwork.math.ucdavis.edu/webw...fcf6dad9f1.png
http://webwork.math.ucdavis.edu/webw...61f20c0741.png http://webwork.math.ucdavis.edu/webw...a1de441b21.png

