You mean 'u' subsititution? It helps you get the anti-derivative easier, therefore allowing you to input values to get the definite integral. I hope I helped :D
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You will obtain a more accurate answer than is possible using graphical methods. It's faster and less work than using a table.
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You put in the answers you got for your variables into one of the equations. If it gives you the correct answer then you solved it, if it's different then either it doesn't work or one of the steps wasn't completed correctly or at all.
It's hard to do work out this intergral here, so post your math question here: quickanswerz.com This site allows you to type in integrals and advanced math without any software by just a click of a button! See you there! Note: Please do read instructions on how to input intergral in the forum.