Integral of x*e^(x^2)/(e^(x^2)+1)

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How calcule this integral: x*e^x^2/e^x^2 + 1

Please help me.
 
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Father20 said:
How calcule this integral: x*e^x^2/e^x^2 + 1

Please help me.

Let [tex]u=e^{x^2}+1[/tex]
 
and further? Thank you for your help.
 
You need to show some effort. What do you do after making a u-substitution?
 
du= e^x^2 dx normally.
 
Not quite.

[tex]\frac{d}{dx}e^{f(x)}=f'(x)\cdot e^{f(x)}[/tex]
 
But after this, what's then. Sorry for my questions.
 
Well first, apply the rule I just showed you. What does du equal?
 

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