# Indefinite Integrals

1. May 24, 2013

### Justabeginner

1. The problem statement, all variables and given/known data
$∫1/(t*ln(t)) dt$

$∫1/(√(t)*[1-2*√(t)]) dt$

2. Relevant equations

3. The attempt at a solution

I used u-substitution for both. For the first equation, my u= ln t, and my final answer was ln|u| + C, or ln(ln(|t|) + C. For the second equation, my u= 1-2*√(t) and my final answer was -ln(u) or -ln(1-2*√(t)) + C.

But both of these are wrong, so I'm not sure what I did wrong. Can I get some guidance on this? Thank you. :)

2. May 24, 2013

### Dick

Both of those are correct as far as integration goes. Must be an error in the answering system.

3. May 24, 2013

### Justabeginner

Oh wow, that makes me feel better now. Thank you! :)

4. May 24, 2013

### Staff: Mentor

5. May 25, 2013

### Justabeginner

Thank you! That site helps.