Q. 233.6( 5 Votes )

Evaluate the foll

Answer :

First of all, take ex common from the denominator, so we get




Assume e - x + 1 =t


d(e - x + 1) = dt


- e - xdx= dt


e - xdx= - dt


Substituting t and dt we get




But t =(e - x + 1)


.


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