If you don't understand the anti-spinoff at the beginning sight, the substitution means that you can Appraise the integral without having an excessive amount of difficulty. There appears to be no method of simplifying or rearranging the integral. Integration by components only operates for using the derivative from the exponential https://gabletoppak.com/how-gable-top-pak-and-paper-bottles-lead-in-sustainable-beverage-packaging/