If you do not understand the anti-by-product initially sight, the substitution means that you can evaluate the integral without having an excessive amount issue. There seems to be no strategy for simplifying or rearranging the integral. Integration by elements only functions for using the by-product from the exponential portion, but https://gabletoppak.com/from-plastic-bottles-to-gabletop-cartons-a-step-toward-solving-the-plastic-pollution-crisis/