Evaluate following. 0ln (1+)excos(1-ex)dx substitution, Mathematics

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Evaluate following.

0ln (1 + π )  excos(1-ex)dx

Solution

The limits are little unusual in this case, however that will happen sometimes therefore don't get too excited about it.  Following is the substitution.

 u = 1 - ex                du = -ex dx

x =0               ⇒       u = 1 - e0  = 1 -1 = 0

x = ln (1 + π )  ⇒      u = 1 - eln (1+ π= 1 - (1 + π ) = - π

Then the integral is,

0ln (1 + π )  excos(1-ex)dx = ∫0(-∏) cosudu

                                  =-sin u|0(-∏)

                                  =  - sin (-∏)-sin0)=0


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