1. Sep 20, 2005 #1

   Entropy

   

   Okay, I just failed my Calc quiz and I want to know how to do the problems I missed. I failed to integrate two of the three equations that were given. The two I missed were:
   
   [tex]\int\sqrt{1 + e^x}dx[/tex]
   
   [tex]\int\frac{\arctan{\sqrt{t}}}{\sqrt{t}}dt[/tex]
   
   Nothing like this is in our book, I don't know where she gets these problems from. She said we're suppose to use some type of u-substitution but I can't figure out which. Can someone walk me through this?

    

   Entropy, Sep 20, 2005
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3. Sep 20, 2005 #2

   TD

   

   Homework Helper

   Try the following substitutions:
   
   [tex]t = \sqrt{1+e^x}[/tex]
   
   [tex]u = \sqrt{t}[/tex]

    

   TD, Sep 20, 2005
4. Sep 20, 2005 #3

   amcavoy

   

   You may need to use integration by parts as well.

    

   amcavoy, Sep 20, 2005

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