If you do not understand the anti-by-product at the beginning sight, the substitution permits you to Examine the integral without having an excessive amount difficulty. There seems to be no method of simplifying or rearranging the integral. Integration by elements only operates for having the by-product of the exponential aspect, https://gabletoppak.com/is-it-legal-to-sell-natural-mineral-water-in-gabletop-cartons-tetra-paks-and-aluminium-cans-in-india/