Integration help

[jasmaster35]

How to integrate: x / (1+x)

[cepheid]

"By parts" would be my first stab at it

[FrogPad]

Would integrating, \frac{1}{1+x} be any easier?

If you got rid of the x on the top it might make your life easier right?

\frac{x}{1+x}

\frac{x}{1+x} - \frac{1+x}{1+x} = \frac{-1}{1+x}

\frac{x}{1+x}=\frac{-1}{1+x}+\frac{1+x}{1+x}

\frac{x}{1+x} = \frac{1+x}{1+x} - \frac{1}{1+x}

\frac{x}{1+x} = 1 - \frac{1}{1+x}

Obviously you don't have to do that in as many steps.

[radou]

How to integrate: x / (1+x)

Use the substitution 1 + x = t.