# Homework Help: Integration by parts

1. Jan 6, 2008

### Millhawk

1. The problem statement, all variables and given/known data
I have tried this question a number of times, but to no avail. Could somebody please help with the first couple of lines, thank you.

$$\int_0^x2cte^{-ct^2}dt$$ where $$c$$ is a postive constant

2. Relevant equations

3. The attempt at a solution
Let u=t and let dv=$$2ce^{-ct^2}dt$$

Last edited: Jan 6, 2008
2. Jan 6, 2008

### olgranpappy

just change variables to $x=ct^2$. you don't need "integration by parts".

3. Jan 6, 2008

### Millhawk

1. The problem statement, all variables and given/known data

The above was edited wrong.

I have tried this question a number of times, but to no avail. Could somebody please help with the first couple of lines, thank you.

$$\int_0^x2cte^{-ct^2}dt$$ where $$c$$ is a postive constant

2. Relevant equations

3. The attempt at a solution
Let u=t and let dv=$$2ce^{-ct^2}dt$$

4. Jan 6, 2008

ditto

5. Jan 6, 2008

### rocomath

Take olgranpappy's advice, all you need is a simple u-sub.

6. Jan 6, 2008

### Millhawk

Thank you, it's amazing how a simple question can transform itself into Electromagnetic Field Theory with such ease when a tired human brain is applied. Thank you again.

7. Jan 6, 2008

### rocomath

Happens to me all the time, no worries :-]